Answer: Many thousands, if not tens of thousands, of people are infected each year by polio, mostly in developing countries, especially India. However, the majority of cases [about 9 in 10] are asymptomatic, or resolve themselves without any symptoms. Paralysis results in fewer than 1% of cases, and thus polio outbreaks are difficult to determine in terms of how many people get infected. In the United States, there is an average of 8-12 polio cases each year, most originating from the live attenuated [weakened] polio vaccine, which occasionally mutates [about one time in six million] into the virulent form.
Answer: Well, this is a very opinion-based question. It is debatable about who really kick-started modern civilization. However, most people agree that the Greeks and the Romans really contributed to our government as it is today. After them, you might include great scientists and inventors like Edison, Fermi, Einstein, and the Curies.
Answer: TB is an ancient infectious disease that has been around for over 30, 000 years. It is Caused by infection from Mycobacterium tuberculosis and in most cases affects the lungs. It is found worldwide. The bacilli spores are transmitted through the air when an infected person coughs or sneezes, but you have to spend quite a long time with an infected person in order to catch TB. It cannot be transmitted by objects such as bed linen or clothes, although it is possible to contract TB by drinking unpasteurised milk products from an infected cow. Written by Anisa Zulfqar
Answer: Those living or traveling in hot, humid, or tropical environments/climates. Dengue-carrying mosquitos congregate where there is standing water and they are more active after dusk and before dawn. I also read that menstruating women, persons of darker skin, and hairy people are more susceptible to mosquito bites.