Abstract:Influenza pandemics have occurred for some time, certainly since the 16 th century. It would be nothing new if another pandemic took place. Why so much concern? Why do the epidemics repeat themselves every year? The phenomenon is due to an important characteristic of the influenza A virus, which undergoes regular mutations, so that every year (or every two or three years) the viruses undergo slight modifications, whereby they acquire greater or lesser capacity to cause disease and the immunity developed agains… Show more
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