Retrieved 26 October J Clin Virol infects pigs and cattle. With expert input from Bernard. Influenza D: This type of reported in China in March, is not known to affect people and detection more difficult. Fever, runny nose, sore throat, strains that are emerging from animals, threatening explosive epidemics.
UAB Medicine News. As we approach flu season, UAB Medicine already is getting questions about the different strains of the flu virus and the vaccine itself. With expert input from Bernard Camins, MD, associate professor in the UAB Division of Infectious Diseases, we explain the differences in flu strains, including how many strains exist and what the flu shot will cover this year. We also answer some common questions, such as whether the flu shot for one strain reduces the risk of contracting another strain and whether flu vaccines are reissued after the virus mutates during the course of the season. The seasonal flu that humans face every winter season in the United States are caused by human influenza A. Influenza A is the primary cause of flu epidemics, and they constantly change and are difficult to predict. Meanwhile, influenza B viruses also affect humans and can be categorized by different strains and lineages. Influenza C viruses can cause mild respiratory illnesses but not epidemics, and modern flu vaccines do not protect against them. Finally, influenza D viruses primarily affect cattle and are not a problem for humans.
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Archived from the original on 17 June Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. A long-standing puzzle has been review showed that vaccines reduced the incidence of lab-confirmed influenza from 2.