Nope actually chlamydia and herpes are the more common stds.
HIV
No. HIV is a STD.
No . . . an STD is a Sexually Transmitted Disease. HIV infection is just one of many STDs.
Yes; having a STD absolutely does increase your chances of contracting HIV.
aids is an hiv: human immunodeficiency virus. and hiv is an std.
Trichomoniasis is the most common protozoan STD in the US. Aside from giardia, which is rarely sexually transmitted, it's the only protozoan STD.
That a person does not have HIV or a sexually transmitted disease.
I very much doubt that there is anywhere where HIV is "popular" .. but it is most common in sub-Saharan Africa.
Chlamydia is the most common bacterial STD in the US, and the most common reportable STD. You should know that not all STDs are reportable, so the CDC doesn't get direct reports about HPV or trichomonas.
Itching
The HIV virus attacks the immune system and can lead to AIDS.
STDs do not reduce the risk of getting HIV. In fact, STDs increase the risk of getting HIV. Any STD elicits an immune response. Its almost like ringing the dinner bell for HIV. Most infections pull CD4 immune cells (cells that HIV infects) to the site of infection (usually). This increases the risk of infection.