Nearly three quarters of all HIV carriers and almost 90% of the children infected with the virus live in Sub-Saharan Africa.
But this is not necessarily a negative trend, because new treatments - although not providing a cure - are allowing those with the virus to live much longer before contracting full-blown Aids.
Killing the virus with, for example, formaldehyde, leaves a platform that presents gp120 to the immune system much as a live virus does.
The two types of vaccine that have been approved -- a flu shot made from inactivated or dead virus and a nasal spray made from live, weakened virus -- will be available free of charge, though some providers may charge an "administration fee, " Sebelius said.
Because this vaccine contains a live virus, the CDC maintains a surveillance system to watch for human infections.
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There was a trend toward the virus helping patients live longer, but the difference is not yet statistically significant.
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It is a live virus preparation developed in the United States by...
The inhalable form is not recommended for pregnant women and children younger than two years of age because it contains a live virus.
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The first round of deliveries will be the nasal spray, which contains live virus, and is recommended for people ages 2 to 49 with no existing health conditions.
They spiked droplets of human mucus with live flu virus, and then exposed it to air with varying levels of moisture.
The oral polio drops used in the developing world are made from a live weakened virus - which carries a minute risk of causing polio in every million doses given.
"We are probably going to have to live with this virus for some time, " he told CNN.
Globally up to 180 million people live with the virus, most are unaware that they have it.
The Agriculture Ministry confirmed late Thursday that the H7N9 virus had been detected in live pigeons on sale at a produce market in Shanghai.
The virus has been detected in live poultry in several food markets where human cases have been found, leading officials to think people are most likely contracting the virus through direct contact with infected fowl.
Flumist can only be given to healthy people, because it uses a live (deactivated) virus.
Eastern Chinese cities have been closing live poultry markets and taking other precautions to limit the spread of the new virus.
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Cities in eastern China where H7N9 first appeared have been closing live poultry markets and taking other precautions to limit the spread of the new virus.
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Eastern Chinese cities where most H7N9 cases have been concentrated have also closed live poultry markets and taking other precautions to limit the spread of the new virus.
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Beijing and major eastern Chinese cities have closed live poultry markets and are taking other precautions to limit the spread of the new virus.
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Eastern Chinese cities where most H7N9 cases have been concentrated have closed live poultry markets and are taking other precautions to limit the spread of the new virus.
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Plant virus infections can go undetected, and indeed, surveys of produce find that the presence of live CaMV infections can be 15% in many different vegetables, and 20% in broccoli, for instance.
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Authorities have halted live poultry trade in cities where cases have been reported, and slaughtered fowl in markets where the virus has been detected.
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