New research found that people infected with medium levels of HIV are most likely to spread the virus to the others. They say that those people with a high viral levels are the most infectious group but they don’t have much time to infect the others since they generally progress to AIDS quickly.

Viral load is a count of viral particles in a blood of a person infected with HIV. This amount varies between individuals. Person with high amount of viral load is more infectious and has shorter life expectancy but don’t contribute much in the spread of HIV. Researchers claim that those with a medium viral load remain asymptomatic for a period of 6 to 8 years before progressing to the symptoms of AIDS so it means that they may be unaware that they are infected with HIV for a long period of time and during that time they can transmit the virus to a number of persons. Because of this, they are most likely to spread the HIV virus.

The conclusion of this research is that effective treatment is needed for those with medium viral load because they cause the largest number of new infections. But, in reality this group is the most common one that isn’t getting the treatment and the reason is probably that the virus has evolved to reach balance between infectiousness and virulence and by doing that it has more chances of getting passed on.