The site of the 28 vaccination projects correlate closely with the earliest cases of HIV infection.

BBC: NEWS | Health | Vaccine link to Aids 'dismissed'

Since 1991, only three cases of dental infection in patients have been documented -- two with hepatitis B and one with HIV, according to the CDC.

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Before 1996, sporadic cases of cyclospora infection turned up only in people who traveled in developing countries and in those with HIV or another condition causing immune-system compromise.

CNN: Cyclospora infection

Since 1991, only three cases of dental infection in patients have been documented -- two with hepatitis B and one with HIV, according to the Centers for Disease Control and Prevention.

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