History, 14.07.2019 10:00 shanua

What are causes of pandemics throughout the world?

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Prevalent throughout an entire country continent, or the world; epidemic over a large area. 150,000 species of bacteria 300,000-1,000,000 viruses that can infect mammals. Pathogens spread when humans are in close contact. Factory farms crowd animals together and they are exposed to each other’s waste, creating a new sanitation crisis. Manure lagoons that are used to store waste have become a new disease transmission opportunity. The vast flight networks of the 21st century, including regional airports, also amplify transmission of pathogens

*Pandemic definition from the Centers for Disease Control and Prevention

Answer from: sydthekid25

A pandemic is a global outbreak of influenza and occurs when a new influenza virus emerges, spreads and causes disease worldwide. Influenza A viruses continuously undergo antigenic evolution. There are two main mechanisms by which they do so: antigenic drift causes regular influenza epidemics, while antigenic shift is the cause of occasional global outbreaks of influenza (pandemics). Antigenic shift implies that an influenza A virus with a new HA subtype is introduced into the human population. This may occur by (i) direct transmission of an avian virus from birds to humans, (ii) genetic reassortment between an avian and a human virus, or (iii) reintroduction of an old strain into the population.
A virus may remain hidden and re-emerge as a pandemic virus when the immunity in the population has waned. The virus that caused the Russian flu in 1977 turned out to be identical in all of its genes to the H1N1 virus that caused a major epidemic in 1950.

Answer from: Quest

c or d. good luck !

Answer from: Quest

the viking voyages took place during the middle ages, which was about this time. 500 to 1350. the viking voyages took place during the middle ages, which was about this time.

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