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Influenza typically causes more severe illness than parainfluenza. While both can cause upper respiratory symptoms, influenza is more likely to result in high fever, body aches, and fatigue. Parainfluenza often produces milder, cold-like symptoms such as runny nose, cough, and low-grade fever. [ 35 ]
The difference between the influenza mortality age distributions of the 1918 epidemic and normal epidemics. Deaths per 100,000 persons in each age group, United States, for the interpandemic years 1911–1917 (dashed line) and the pandemic year 1918 (solid line).
Influenza B virus is almost exclusively a human pathogen, and is less common than influenza A. The only other animal known to be susceptible to influenza B infection is the seal. [47] This type of influenza mutates at a rate 2–3 times lower than type A [48] and consequently is less genetically diverse, with only one influenza B serotype. [26]
(Learn the difference between Covid-19 symptoms vs. flu symptoms.) It’s important to know that a simple flu shot could reduce your risk of getting seriously ill with the flu, and you should get ...
Still, with the holidays around the corner, doctors worry about potential surges of influenza and COVID-19. Influenza activity is already deemed “ very high ” in North Carolina by the Centers ...
H. parainfluenzae biotypes I and II are capable of natural genetic transformation. [3] Natural genetic transformation is a bacterial adaptation for DNA transfer. In order for a bacterium to bind, take up and recombine exogenous DNA into its genome it must enter a special physiological state termed natural competence.
Influenza viruses are members of the family Orthomyxoviridae. [2] Influenza viruses A, B, C, and D represent the four antigenic types of influenza viruses. [3] Of the four antigenic types, influenza A virus is the most severe, influenza B virus is less severe but can still cause outbreaks, and influenza C virus is usually only associated with minor symptoms.
Influenza strains are named for the specific hemagglutinin variant they produce, along with the specific variant of another surface protein, neuraminidase. These hemagglutinins are subject to rapid evolution via antigenic shift and drift in the influenza avian reservoir. This results in new subtype of hemagglutinins being created frequently ...