SWINE FLU - Are We on The Verge of a Pandemic? flu pandemic Too early to say whether it will lead to a pandemic Current treatments do work, but there is no vaccine Good personal hygiene, such as ... S Rai,A Dasgupta,S Narwade 被引量: 0发表: 2013年 Developing Countries, Vaccine Ac...
polio epidemics had been growing worse and worse, with tens of thousands of new cases reported each year, often in the summer. Different people experienced differing symptoms, from a flu-like