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Originally Posted by
Suvroc 
I apologize if I mis-spoke but I could have sworn that I read that at the CDC as I have been spending most of my time on government sites. I can visualize the page but can no longer find it. Though, it's interesting to me that TB is spread through the air (form the CDC) and is one of the most common infectious diseases in the world (from the CDC), yet is not very contagious
TB is fascinating. It is spread through the air. However, it is not all that pathogenic. It often goes into a latent phase (that's what TB tests check for) when it is not contagious at all. However, under certain conditions of immunosuppression, or just long-term infection, it can become active, at which time it can be spread. Even so, it usually takes prolonged contact to spread it.
Many countries in the developing world have a big problem with TB for several reasons. First of all, it has that long latent period where it can not be spread. Second, in the developing world people are more likely to be living in very close quarters. Third, and this is the biggie, proper treatment of TB requires up to 18 months of daily medication. Miss a few pills, you get resistance. Proper access to medical care and a strong public health sector to ensure compliance with the treatment regimen is key. THIS is why rates of TB are falling in the US, but rising in other parts of the world.
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