Feline infectious peritonitis (FIP) is a fatal, incurable disease that affects cats.It is caused by Feline Infectious Peritonitis Virus (FIPV), which is a mutation of Feline Enteric Coronavirus (FECV) - (Feline coronavirus FCoV).Experts do not agree on the specifics of genetic changes that produce the FIPV.t is caused by Feline Infectious Peritonitis Virus (FIPV), which is a mutation of Feline Enteric Coronavirus (FECV) - (Feline coronavirus FCoV).
Some people get mild cases of only a few days, o â¦ thers get severe cases of a few weeks or more and are hospitalized. On average, the symptoms of the flu generally last 3 - 10 days but the H1N1/09 virus lasts more typically 4 - 7, although a cough and fatigue may persist for up to 2 weeks.
The symptoms, severity and infection of flu depend on a person. Usually, the temperature that you acquire with the flu goes down in 48 hours. On the other hand, worst flu symptoms can last more than 4-5 days and complete recovery may take around 10 days or even longer.ote: Flu lasts for 1 to 2 weeks. The answer to the question how long does the flu last is over here. The above listed symptoms might linger for a week. But the gloom and tiredness feeling can persist for few weeks. Many people who suffer from flu feel better within 1 or 2 weeks.