How many people are contagious after ARI

How many days is a person infected with ARVI: how long does the flu virus live

The flu virus is contagious and poses a great danger to a person - history knows cases when a sudden outbreak of disease covered entire countries, taking the lives of many people.

Moreover, the complications arising after a previous acute respiratory viral infection are also dangerous.

An organism that once undergone ORZ is not protected from a new infection - a constant mutation of the virus takes place, it lives, forming new complex forms with even greater degree of infectiousness.

Specialists, using strains of influenza, develop new vaccines to prevent the spread of another outbreak of ARVI. But the bulk of the population ignores vaccination against influenza - therefore the risk of infection is high.

To prevent the spread of infection can only quarantine measures - to limit the communication of healthy people with carriers of infection. Therefore it is very important to know exactly how many days a person with a flu can be contagious.

A unequivocal answer to this question by doctors has not yet been found. French physicians, for example, relying on their studies, argue that when an infection with ARVI is in contact with the patient for at least four days should be strictly limited.

Employees of the research center of the University. Pierre and Marie Curie (Paris), studies were conducted on the intensity of the disease in volunteers infected with the influenza virus. Experts tried to find the answer to the question of how many days the virus lives in the body and how long it remains contagious.

For this purpose, several groups of people were selected, followed by a group of medical experts for ten days. Calculation of the probability of disease among infected participants in the experiment was carried out on the basis of a mathematical algorithm.

Based on the results of the study, scientists found that isolating participants with primary symptoms of influenza made it possible to reduce the number of infected by half.

Based on the results of the experiment, the scientists concluded that for the period from the moment of infection and transition pathology to the active phase (4 days), the probability of spreading the virus to the nearest environment significantly decreases.

Features of the incubation period

  • Low probability of detection of infection the first day;
  • Absence in the incubation period of the characteristic features inherent in the influenza virus;
  • Individual duration of the incubation period, depending on the state of the patient's immune system;
  • Sudden development of the disease after the end of the incubation period.

The first day with a cold to recognize the signs of infection is very difficult because of the lack of clear symptoms. Being exposed to the attack of the virus, a person does not suspect that he became a carrier of the infection, until the first signs of ARVI appear.

Since the virus remains active for about 7 days during the incubation period, it is almost impossible to determine the time of infection. The incubation period of the flu is secretive, and it is possible to determine only how long it lasts, conditionally, based on the typical manifestations of it.

The duration of the incubation period can vary depending on the state of the human immune system, as well as on the presence of other viruses. With the increased attack of a large number of viruses on the immune system, the body malfunctions and the intensive development of pathology.

The virus has the ability to multiply with a huge speed - a couple of days after infection the patient becomes a dangerous virus carrier for a close environment. The probability of the danger of infection from such a patient disappears only after a week.

After the incubation period, the disease passes to the open phase. The patient senses this by suddenly falling heaviness all over the body, muscle soreness and joint arthritis.

It is necessary to identify the flu virus in time. For this, it is necessary to know the primary signs of acute respiratory viral infection. Correct therapy already in the incubation period gives a positive effect.

Main risks and signs of infection

The insidiousness of the influenza virus lies in the difficulty of determining it at the first stage of the disease. A person does not notice when he got infected. Further, the presence of the virus in the body can be judged if the patient has the following characteristic signs:

  1. Increased temperature;
  2. Coryza, cough;
  3. A sore throat
  4. Your ears hurt with colds.

Infection occurs most often in public places with a large crowd of people - these are shops, public transport, offices. Also, there is a high probability of infection through common household items, in drafts.

In people with weakened immunity, the duration of the incubation period increases. The group at risk of contracting the virus is people who live with the infected person.

Duration of the disease in each also can vary - people with good health tolerate the disease, which usually lasts from 4 to 14 days.

If the period of a person's feeling of a painful condition longer than the specified time, it is necessary to see the doctor to exclude the possibility of secondary infection or the development of complications.

Prevention of Infection with the Influenza Virus

The influenza virus differs from other viral pathologies by its "secretiveness" - even before the first signs of illness begin to appear, the patient is already spreading the infection. Until the moment he is diagnosed as infected with a viral infection, a middle-aged patient is dangerous for the carrier around the virus for about 5-10 days.

During this period he is able to infect a large number of people around him.

Often, for a cold, a person continues to go to work, especially if he works on the basis of an employment contract. This is due to the terms of the contract and the current economic situation, when care of the family budget exceeds the concern for one's own health.

The apparent cold may be signs of a virus. The employee becomes a carrier of the infection and can infect a significant number of people. Therefore, when there are several cases of ARVI in children's institutions, educational institutions and at work, quarantine is appointed.

  • Bed rest should be observed until the temperature normalizes and the appetite appears in the patient.
  • If the norms of the home quarantine are not complied with, the activity of the virus that continues to work increases the duration of the probable infection of others.
  • Non-compliance with preventive measures leads to infection of a large number of people.

The patient should undergo a course of prescribed treatment while observing bed rest and proper nutrition. If these requirements are not met, the doctor may prescribe hospitalization. About the period of infectiousness of the patient with ARVI will be described in the video in this article by Dr. Komarovsky.

The incubation period of ARVI

Influenza virus, penetrating the human body, does not immediately make itself felt. Therefore, for the timely detection of the first symptoms and the beginning of treatment, it is desirable to understand how much The incubation period of acute respiratory viral infection, how to determine this condition and what measures can be taken at the very beginning infection. In addition, it will help prevent the infection of surrounding people.

What is the incubation period for influenza and ARVI in adults?

It should be noted that there are many varieties of acute respiratory-viral infections, the type of which depends on the etiology and timing of the development of clinical symptoms. The most common among them:

  • flu;
  • reovirus;
  • respiratory syncytial virus;
  • coronavirus;
  • adenovirus;
  • paragripp;
  • rhinovirus;
  • Coxsackie virus;
  • ECHO virus.

As a rule, all these subtypes of the disease under consideration are similar in features that characterize the acute intoxication of the organism:

  • cough;
  • coryza;
  • swelling of the mucous membranes;
  • hyperemia of the skin and mucous membranes;
  • temperature increase.

But often there is a mixture of various clinical manifestations, which further provokes the emergence of secondary infectious complications in the form of catarrhalic tonsillitis, pneumonia, bronchitis. Moreover, the development of these diseases can occur directly during the incubation period of acute respiratory infections. In such cases, it is believed that immediately after infection with the virus in the body, intensive multiplication of pathogenic aerobic and anaerobic bacteria began.

How many days is infected with ARVI?

Since the virus enters the body, the person is its carrier, respectively, can infect others, even if the obvious symptoms have not yet appeared. Usually, the flu and other types of described ailment begin quickly and acutely, within 1-3 days, but with strong immunity defenses the incubation can last about a week.

It is worth noting that a patient with acute respiratory infections is contagious throughout the course of the course of the pathology until all cells of the virus in his body die. This means that even with persistent improvements, lowering body temperature to normal values ​​and eliminating external flu symptoms a person still remains a carrier of the disease and can pose a danger to others, because SARS is transmitted easily - airborne by way of.

How long does the incubation period of ARI and ARVI last?

First of all, it is necessary to clearly understand the difference between these two diseases.

In acute respiratory infections, there is a local lesion, most often - the respiratory tract, without a significant increase in temperature (rarely exceeds 38 degrees). The disease progresses slowly and does not spread to other organs, the symptoms of intoxication are either weak or not pronounced at all.

Influenza and SARS are characterized by a sharp, intense onset, with a rapid onset of signs of ailment. In addition, these pathologies cause several groups of clinical manifestations at once:

  • from the gastrointestinal tract (vomiting, nausea);
  • upper respiratory tract (cough, sore throat, nasal congestion);
  • nervous system (migraine, insomnia).

The main difference between the considered respiratory diseases is that the cause of ARVI is mandatory is a viral infection, and the patient is infectious for a long period of time, whereas ARI does not have these qualities are inherent.

The incubation period of influenza, as already indicated, is short, and in ARI it can be up to 14 days. In this case, the condition of the victim is relatively normal, and the temperature increase is sometimes or completely absent, or reaches a low-grade value.

How many days sick with the flu can be contagious?

How many days sick with flu is contagious? The relevance of this issue is growing every year, given the fact that the virus of this infectious disease mutates annually, acquiring more complex forms. Based on the viral strain, a new vaccine is being developed by specialists. However, most conscious citizens openly ignore vaccination prevention of the disease, which leads to infection of the body with a pathogenic virus. To exclude ubiquitous infection with a similar disease becomes possible on condition of strict compliance with the patient's quarantine regime. To do this, you need to know how long a virus can be dangerous through its carrier.

Among practicing doctors, there are several opinions about which period the patient is most dangerous to surrounding people.According to the results of studies by French specialists, it was established that a person infected with the influenza virus should be isolated from the public for at least four days.

Employees of the research center at the University of Paris named after Pierre and Marie Curie conducted A unique experiment involving several volunteer groups, deliberately infected with a viral infection. Within 10 days, a special group of experts conducted daily monitoring of the intensity of pathology in individual patients. The mathematical algorithm is based on the calculation of the number of potential victims of infection.

Analytical conclusions on the results of the experiment showed: the isolated situation of participants in the experiment with the primary symptoms of the disease during the day narrowed the circle of infected by half. Four days later, when the disease began to progress, the patient no longer posed a significant danger to the immediate environment.

The incubation period of the virus

The first day after infection with the virus pass without visible manifestations. Timely detection of initial signs of the disease, competent therapy require knowledge of the duration of the incubation period and the measures necessary to reduce the likelihood of infection of other people.
  1. The duration of incubation of acute respiratory viral infections is on average no more than a week. Until the initial signs of pathology appeared, the infected does not assume that he became a carrier of the infection. In this regard, clarifying the moment of infection is considered difficult.
  2. The concept of the incubation period of influenza is somewhat arbitrary. The latent phase of the disease, its duration is determined on the basis of the typology of infection, penetrated into the human body. The incubation period of influenza passes without signs of the presence of the virus.
  3. The duration of this phase of development also depends on the developed immunity of the person and other viral elements that are in the body. At a time when the immune system is failing due to the high number of viruses, the flu infection begins an intense manifestation.
  4. The rate of reproduction of viral bodies is quite high. Two or three days after infection, the patient is able to infect the people around him. Only after the expiration of almost a week the patient ceases to represent the danger of infection.
  5. Symptomatic of pathology is characterized by suddenness. After the end of the incubation phase of the disease, the patient's body begins to feel unnatural heaviness, aches.

Primary signs of the disease

As it was mentioned above, it is quite difficult to determine the time of infection, as the infection penetrates into the body imperceptibly. Potentially dangerous for infection are places of large concentrations of people, public transport, windswept places. At the first stages of the manifestation, the disease is accompanied by a cough, a runny nose. The temperature can rise, there is a pain in the throat, stuffiness of the ears.

How long will the infectious person be infected with the flu? The virus of the disease spreads through the air and through use with a sick one household appliances. In the presence of weak immunity, the duration of this phase can be increased. When other people live with the patient in the same room, they constitute a potential risk group for the virus. People who have strong health and are in excellent physical form, can be sick from 4 to 14 days, but the intensity of manifestations of pathology will be different. When a painful condition and muscle aches continue for more than a specified period, you should visit a doctor, possibly re-infection with a virus infection or the development of complications.

Home isolation of the patient

In the event that a certain number of people are infected at a manufacturing company or in an educational institution, quarantine is appointed. The process of determining this number can be called quite subjective, and it is determined by the leaders of the company or educational institution. Often employees of serious firms try to work at the limit of their capabilities, especially if a civil law contract is concluded. In this situation, the flu for such employees, first of all, will hit the family budget, because the absence of an employee due to illness will not be paid.

For successful treatment, adequate comfort is required. If the patient's living conditions do not meet the standards, there is a possibility of inpatient treatment. Compliance with bed rest should be adhered to normalization of patient's appetite and recovery of normal body temperature. If a person with influenza does not observe the principle of home isolation and at the same time is engaged in active labor activity, the term of infection of people around him is significantly increased. Throughout the day, such a person can infect a large number of potential "victims". Secure yourself from a flu infection is not easy. The best solution is to prevent the possibility of the disease through preventive measures.

Before the patient learns about his disease, he will already be the bearer of pathogens. From the remaining viral pathologies, the flu differs in that it can begin to spread to others before manifesting the initial signs of the disease.


When the symptoms become pronounced, a middle-aged patient is able to spread the infection from 5 to 10 days.

However, four days after the onset of the disease, the intensity of infection spreads significantly. Patients of childhood can be the bearer of a harmful virus for more than 8-10 days.

To determine when a patient ceases to be contagious is not easy. Patients with severe immunity dysfunction are able to carry the influenza virus for several weeks, sometimes even months from the time they became infected.

Necessary precautions

It is very easy to catch a harmful infection. The first two days, a person infected with the influenza virus, is able to infect the maximum number of people. Due to various circumstances, the patient is forced to leave the house, use public transport, be in supermarkets, pharmacies. Thus there is a rapid spread of infection and infection of surrounding people with influenza.

When talking, sneezing, coughing, the carrier of the disease creates an infectious field filled with microscopic mucus of saliva and sputum that are floating in the air. An uninfected person, being in such airspace, becomes infected, because the mucous membranes of the nasal and oral cavity for illness are the entrance gates to the human body. It is necessary to be well aware of the manifestations of this disease, be able to identify the external symptoms of ailment in humans.

There are three forms of the disease:
  1. Easy. The maximum body temperature in this case is 38 ° C. The manifestation of the remaining symptoms remains imperceptible.
  2. Average. The temperature rise can reach 39 ° C or more. There is a clear manifestation of signs of influenza: the presence of muscle aches, impulsive headaches, high sweating, general weakness of the body, a strong cough, and a cold. In some cases, there may be dull pain in the abdominal region.
  3. Heavy. The patient's temperature reaches above 40 ° C. These signs are supplemented by bleeding from the nasal cavity, vomiting. There may be convulsions, hallucinations.

After the flu, when the key symptoms of the pathology were gone, the weak condition of the body and the whole body will accompany the patient for another two to three weeks. There is a headache, accompanied by insomnia and irritability. Each person has its own peculiarities of the transfer of this disease: someone does not experience any complications and is quickly restored, someone suffers serious health damage. If the patient has cardiac and pulmonary pathologies of a chronic nature, it is likely that their exacerbation will occur.


Preventive measures against influenza imply early diagnosis, quarantine of the patient for one week. If the quarantine is carried out at home, the patient will need a separate room. It must be systematically aired, do a wet cleaning, disinfect household items, dishes. Contact and communication with the patient must be drastically reduced. A good preventive tool is vaccination.

How many days does a person remain contagious after having a flu (ARI, ARVI)?



is contagious in the first 4 days before the onset of clinical symptoms and another 5 days after the disappearance of the clinic

Vadim Bogdanov

For some time yes - not less than 2 weeks.

Natalia Medvedeva

If we talk only about ARVI and ARD, then only in the period of Heat.


a person is contagious the first five days after infection


Transfer of the causative agent from a person to a person is carried out during the whole period of the disease by airborne droplets during coughing, sneezing, and talking.

T e r a p i 03

If the person who was ill with ARI the doctor writes out that the person any more is not infected, and only can again catch.

How long does a runny nose get contagious to others?

There are often situations when mothers of children on the playground or in the garden look askance at the child with a cold and try to take their children away. After all, for them, the runny nose means that the child is contagious, which means that it can transmit viruses to others. In fact, over the question whether the runny nose is contagious, the spears have broken not in one dispute.

Whether the nose is contagious or not, and how long a person with a stuffy nose can remain potentially dangerous - such questions are of concern to many who do not want to get sick themselves, and do not seek to infect their loved ones.

What is a common cold, and what does it point to?

Coryza refers to a specific reaction of the nasal mucosa to various stimuli. As a result of the invasion of dust, viruses, bacteria, microbes and other organisms, an intensive release of mucus begins, with the help of which the body tries to get rid of irritation. And everything comes out of the nose together in the form of mucus. This runny nose is a clear and fairly liquid discharge. It is these that are not contagious, and you can not be afraid of them.

Similar manifestations are allergic rhinitis. It can be accompanied by an active sneeze. This is a common cold reaction to any pathogen - pollen, food, animal hair, household mites, etc. Such a rhinitis is not to be feared.

However, most of the common colds are a warning signal. By itself, however, it is not contagious, tk. all ARVI are virus infections. A healthy person's contact with such secretions is dangerous. After all, in the allocation of a sick person in excess there are viruses that are easily transmitted by airborne droplets.

There is also such a runny nose that arose from the appearance of a bacterial infection in the body. This may be the result of improper treatment of a viral infection, when bacteria are attached to the wrong dose of drugs, and the patient's condition worsens.

How can I get infected from secretions

You can get infected by everyday means, for example, picking up the same thing that a sick person had held for a short time before. After all, he could blow his nose, and then hold something. It often happens in kindergartens, when babies still have a pretty detached view of hygiene.

You can also get infected in a room where the carrier of the virus has visited. Especially if he blew his nose well. After all, viruses spread faster through the room, covering a large surface.

Runny nose is contagious to others just as much as it is of a different color and consistency from normal. For example, bacterial rhinitis is a green-yellow thick discharge. Such a runny nose is exactly contagious. On average, the infectiousness of a person with acute respiratory infections is about 5 days. After the disease goes to a decline, and the runny nose becomes a residual symptom that does not carry danger to others.

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