Sentence examples for large epidemics from inspiring English sources

These are called "antigenic shifts" and tend to result in large epidemics.

Before vaccination became routinely available in 1957 large epidemics occurred every three to five years in the UK.

Many countries doing poorly have large populations, so even though their infection rates are lower than Africa's, they have large epidemics.

During the 19th century, waterborne diseases were responsible for large epidemics of dysentery, typhoid fever, cholera, among others (Smith 2002).

This mutation may already take place in the first infected flock; hence early detection of LPAIV outbreaks will reduce the likelihood of pathogenicity mutations and large epidemics.

In particular, before the outbreaks in the US, large epidemics had occurred in Sweden.

Sub-Saharan Africa has been plagued by large epidemics of meningococcal meningitis for over a century, leading to it being labeled the "meningitis belt".

The strains include two epidemiologically significant strains that gave origin to large epidemics and to out-of-season activity.

Nonetheless, the relative importance and efficiency of the different mosquito vectors of CHIKV in any of these large epidemics remains unclear.

Thus, there is a potential risk for large epidemics of urban yellow fever now that migration of people from rural areas may introduce the virus into areas of high human population density, such as large African and South-American cities.

In 2002, a GII-4 norovirus genetic variant spread within populations around the world causing large epidemics throughout the year and was characterised by an atypically large number of outbreaks during the summer and autumn months [18], [19].