The World Health Organization (WHO) and the U.N. agency UNAIDS received a happy surprise last week.  A new vaccine proved to be somewhat successful in preventing one strain of the HIV virus in a sampling of 16,000 volunteers in Thailand classified as individuals at  average risk to contract AIDS (Acquired Immune Deficiency Syndrome).

According to various sources, including the Scientific American website, 51 individuals in the vaccinated group contracted HIV by the end of the three-year trial, while 74 in the placebo group contracted the virus that causes AIDS.

Participants received condoms, sexual counseling and treatment for any STDs contracted during the study. They received an AIDS test every six months.
These numbers amount to a 31.2 % efficacy rate; the scientific community typically looks for vaccinations with an effectiveness of 70 % or higher.

Nonetheless, the results show a glimmer of hope where, previously there was none. The series of six injections were made up of Sanofi-Aventis SA’s ALVAC and VaxGen Inc.’s AIDSVAX, which each proved ineffective on their own. The vaccines are not made from whole virus and cannot cause HIV.

The scientists and researchers involved in the project report “cautious optimism” about the possibility of discovering an even more effective vaccine, and possibly even a vaccination that could prevent the HIV virus from turning into a full-blown AIDS infection.

This set of vaccinations had no effect on HIV levels of infected individuals – somewhat disheartening news as it shows that researchers may not know what factors contribute to HIV immunity, even after decades of research.
It’s also important to stress that this combination of vaccines only proved marginally effective (30 percent) in this particular strain of HIV prevalent in Thailand.

More Research Needed

In the past, I’ve spoken out quite passionately against vaccines, most notably the HPV vaccine. I don’t want to rain on the “cautiously optimistic” parade this news has evoked, but my fears about acting too hastily with any immunizations remain.

Obviously, more research is necessary in regard to the HIV vaccination and it’s nowhere near ready for FDA-approval to bring it into the U.S. market.  We haven’t heard any reports of the side effects reported with the new vaccination, either, so I’m sure that requires additional research.

However, for the scientific community to go from point zero: “We’re never going to find a vaccine against AIDS, it may not exist,” to such promising test results truly is cause for celebration.

We’re living in an exciting time when researchers may have found vaccines against certain strains of both cancer and AIDS. This is news that, growing up in the 80s, I’d never imagined.

Encouraging Promiscuity?

As with the HPV vaccine, some fear the promise of an HIV vaccine may encourage lackadaisical sexual behavior, increasing the prevalence of HIV and AIDS. Let’s hope that, if the day comes when an HIV vaccine receives FDA approval, it will be close to 100 percent effective. Who knows? With enough people receiving immunization and the herd immunity that develops over time with immunizations, it may be within our lifetimes that we see AIDS eradicated.

Even if this happens, condoms still prevent against a large number of other sexually transmitted diseases and infections. Safe sex and the use of condoms will continue to be important consideration for the prevention of a number of diseases – not to mention an easy, inexpensive and hormone-free way to prevent unwanted pregnancies.

And, it’s important to remember that we may still be years, if not decades, away from a truly effective AIDS vaccine. In the meantime, education and safe sex remain paramount.

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