What factors can cause the influenza outbreak?

Factors

that cause influenza outbreaks include seasonal weather patterns, immunity levels to a specific virus strain and the occurrence of human contact that spreads the virus. In the winter months of the year there is a generally seasonal influenza outbreak and often happens in places such as schools, care homes and other areas where people are approaching contact. Infectious viruses of type A and B influenza for most seasonal influenza outbreaks can develop in community and regional epidemics. These annual outbreaks are caused by tribes of viruses on which people have some natural immunity, resulting in an epidemic that usually do not cause high mortality. This differs from pandemic, which is characterized by the spread of new tribes of influenza virus that people do not have immunity. Sources of new strains include domestic and wild birds, pigs and other animal species. Problems begin when animal flu virus is transmitted to humans. In order to break out the influenza, this new strain must be able to move from man to maněka. People did not build any natural immunity to this new virus strain, so everyone is susceptible to this disease, causing it to spread rapidly.

Records show that pandemic is relatively rare, with only a few centuries. During the 20th century, the most famous flu pandemic swept the world from 1918 to 1919. It is estimated that up to 40 million people could die during this pandemic, while hundreds of millions fell ill by the virus. Other pandemics during the 20th century include Asian flu pandemic in the late 1950s and Hong Kong influenza from the late 1960s. The outbreak of influenza in 2009 and 2010 also achieved pandemic levels when the new flu tribe spread worldwide worldwide.

Frequent global travel is a factor influencing the spread of influenza. Business, tourist and refugee travel along with international consignments of animals help out throughoutDu virus flu faster than in the past. The virus is often spread by traveling before its detection. Once the new influenza virus has been identified, the supply animals are monitored or terminated. Migration patterns of natural birds can also affect the spread of viruses that have the potential to be transmitted to people.

Although seasonal flu symptoms are generally mild, some population segments are endangered than others. Older people and people with chronic health may have more serious symptoms. The most common symptoms are pain and pain, chills and fever, but endangered may develop complications threatening life. Simple strategies to stop the spread of virus include frequent hand washing, avoiding contact with infected individuals, and covering sneezing or coughing tissue. Each season, influenza vaccinations are available to increase immunity to strains for which they are expected to circulate.