"SSM" <shailendrakumar.mehta@de.bosch.com> wrote...

No one's ever proved that mosquitos can't spread HIV, it falls into the
category of possibilities they haven't bothered to study and simply
label it as "improbable."  Most likely, it is possible but in the West
the infection rate is so low that it is probably improbable that a
mosquito could bite an infected person then bite another person within
the period of time before it digests the blood and inactivates the
virus.  BUT, I suppose that in a place like Africa where 50% or more
of the population is infected that mosquitos become plausible vectors
(and which might actually explain Africa's high rate, as it has also
long been a hotbed of malaria).

BTW, a few years ago there was a mosquito in my bathroom, I whacked
it and it splattered red blood on the wall.  I'm certain insects
don't have red blood so it was either human or animal blood.

Unknown.  And in the West it is extremely rare, while in Africa it seems to
be very common.  The latest theory involves foreskins, that the small
amounts of female vaginal fluid get under the foreskin of the penis and it
protects the virus long enough for it to enter through the skin or the
other theory is that the foreskin itself has receptors specific to the HIV
virus and encourages infection.  Circumcised men seem much more immune to
infection via heterosexual vaginal intercourse.

Bockarie MJ, Paru R. Can mosquitoes transmit AIDS? P N G Med J. 1996
Sep;39(3):205-7.

Papua New Guinea Institute of Medical Research, Madang, Papua New
Guinea.

   Surveys to determine knowledge regarding AIDS have shown in many
countries, including Papua New Guinea, that a large proportion of the
literate population still mistakenly believe that mosquitoes can
transmit the AIDS virus from one person to another. In this paper we
review the theoretical mechanisms which would allow blood-sucking
insects such as mosquitoes to transmit virus and discuss the evidence
against transmission of HIV by mosquitoes. AIDS is a sexually
transmitted disease with no scientific evidence for arthropod
transmission.

   PIP: Surveys in many countries, including Papua New Guinea, show
that a large proportion of the literate population still believe the
fallacy that mosquitoes can transmit the AIDS virus from one person to
another. Since AIDS was first recognized, many have reported on the
possibility of mosquito involvement in the transmission of the virus.
In 1988, almost half of 6625 men and women interviewed in Zaire and
nearly half of 4189 teacher-trainees interviewed in Zimbabwe believed
in the transmission of AIDS by mosquitoes. A recent survey involving
1500 high school students from 14 schools in 4 different provinces in
Papua New Guinea revealed that 34% of them considered mosquitoes to be
carriers of HIV. Although mosquitoes are carriers of yellow fever,
dengue fever, and Japanese encephalitis, there is no evidence that
mosquitoes can transmit HIV. Studies with HIV have shown clearly that
the virus disappears in the mosquito after about 1-2 days, the time
required for the mosquito to digest the blood-meal. Since the virus
does not survive to reproduce and invade the salivary glands,
biological transmission of HIV is not possible. It has been calculated
that, for mechanical transmission, an AIDS-free individual would have
to be bitten by 10 million mosquitoes that had been feeding on an HIV
carrier to receive a single unit of HIV from contaminated mosquito
mouthparts. In short, there is still no evidence of arthropod
transmission of the HIV virus.

HIV transmission heterosexually is indeed more likely to be male to
female, however, clearly it can go in the other direction.

The penis is not a solid ram rod. It's got a hole in the tip, the skin
tears. If there are sores on the penis, this can facilitate
transmission. It also appears that the presence of a foreskin may
enhance female-to-male transmission.

Best bet is for the man to wear a condom. A woman may also use a
female condom.

        George M. Carter

Its just one of many medical hoaxes http://www.whale.to/a/hoaxmed.html