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The new study shows that those who are at a high risk of contracting HIV are more likely to get tested for HIV.

And when they do get tested, those with higher levels of CD4 count are more than twice as likely to be diagnosed with HIV as those with lower CD4 counts.

“This suggests that the CD4 levels in HIV-positive individuals are more important than their CD4 level,” says Dr. John A. Foti, an infectious disease specialist at the University of Colorado School of Medicine in Boulder.

Foti is the lead author of a paper published in the journal Infection Control and Prevention that found that CD4 is the best indicator of whether someone has HIV.

“We know from previous studies that the highest CD4 (count) is about 1,000 cells per cubic millimeter (cm3), and if your CD4 number is over 1,200, then you are at high risk,” he says.

“The CD4s of the CD1 (uninfected) and CD4/CD8 (infected and symptomatic) groups are lower than those of the HIV-infected.”

Foti and his colleagues looked at data from more than 8,000 people who were HIV-negative, but had low or high CD4 numbers.

They looked at people with at least three viral load tests, the number of people tested for a certain disease, and the number who tested positive for HIV and who were infected.

The researchers also looked at the people’s sexual behavior, which includes how often they have sex, who they have sexual contact with, and whether they had sex outside of marriage.

They found that people with higher CD4 scores were about half as likely as those in the CD3-lowest CD4 range to have sex outside their marriage, to have multiple sexual partners, and to have unprotected anal intercourse.

“People with higher viral loads are more often sexually active, and more likely than those with low viral loads to engage in unsafe anal sex,” says Foti.

“They also have more unprotected anal sex and more STIs.”

For those who have HIV, CD4 may be the best marker of infection, but it is not the only indicator, says Foto.

“There are other things that can influence the CD8 count, like medications that reduce the number and size of CD8 cells, which are markers of infection,” he adds.

“If you have low CD8 and high viral load, then that’s more likely that you’re going to be infected,” he explains.

And while some people may be able to avoid getting tested, many others have a high CD8 number and risk of HIV.

Foto cautions that it is difficult to say exactly how often HIV occurs in a given population because of a variety of factors.

“It’s important to look at different subgroups of people to make sure you are getting the right numbers of CD40 and CD8s,” he notes.

“And it’s also important to understand that the prevalence of HIV may be higher among people who have low viral load.”

While high CD40 counts are not a guarantee that a person will get infected, they can indicate that the risk of infection is higher than the low-CD4 count, Foti says.”

In that case, people with lower viral load have higher numbers of infected people, which is the cause of the low CD40.”

While high CD40 counts are not a guarantee that a person will get infected, they can indicate that the risk of infection is higher than the low-CD4 count, Foti says.

And in general, it’s good to have CD4 tests.

“These tests can be an important way to get a good diagnosis of HIV and to see whether you’re at a higher risk of developing the virus,” he said.

“But when we have a CD4 test, it is a little bit different because we’re looking for the numbers, and that’s the most important thing.

If we have the right number of CD3 cells, then we’re good.

But if we have low numbers of cells, the virus is not going to replicate in our cells.

So if we’re going into the hospital, the tests are not going, ‘Oh, I’m infected.'”

Follow LiveScience senior writer Stephanie Pappas on Twitter @sipappas.