Backyard poultry were more common in epidemic districts (71%[67% 75%%] vs. 45%[42%48%8%]), where keeping poultry declined 17%14%20–20%) compared with 8%6%10%10%) in nonepidemic districts.
As shown in Figure 3, there was evidence that V. cholerae O1 isolation was more common in the environment preceding epidemic peaks of disease among humans; however, numbers of isolations were too small to permit statistical analysis.
Although data are limited, there was at least a suggestion that isolation of V. cholera strains from environmental reservoirs was more common at the beginning of epidemic spikes of human disease (as has been described in association with environmental reservoirs) (16, 17, 27 ) rather than at the height of epidemics among humans, as might have been expected related to fecal contamination.
In Canada, an epidemiologic association with alcohol abuse, homelessness, hepatitis C virus infection, and illicit drug use was identified, suggesting that the emm59 GAS epidemic was more common among a specific susceptible population consisting primarily of middle-aged persons with underlying medical conditions or histories of substance abuse (7 ).
African epidemics became much more common in the 20th century, starting with a major epidemic sweeping Nigeria and Ghana in 1905 1908.
There are the obvious examples of The Black Death and other epidemics, but more common ailments have had their effects on history as well.
From 1980 to 2002, although epidemics were more common during December, January and February, no major differences were observed across the different months.
Epidemic malaria is more common in areas of mesoendemicity or hypoendemicity (2, 3 ).
Sexual risk behaviour studies among men became more common after the emergence of HIV epidemic in early 1990s [ 10].
This type of Black Friday shopper is becoming more and more common, almost as if there's an epidemic sweeping the nation causing more of these types.
