AIDS Denialism: Conspiracy Theories Can Kill

Posted on April 17, 2013 by Anna

This scanning electron micrograph from 1989 reveals HIV particles (colored green) emerging from an infected cell. Image: CDC’s C. Goldsmith, P. Feorino, E.L. Palmer, W.R. McManus

We’ve all heard various conspiracy theories; we may or may not find them credible, and we might chalk up opposing viewpoints to simple differences in opinion. Sometimes, however, conspiratorial narratives are woven around matters of life and death — and in such cases, the spread of such ideas can influence dangerous changes in behavior and even government policy.

AIDS denialism is based on the idea that human immunodeficiency virus (HIV) does not cause AIDS. Although the existence of HIV and its causal connection to AIDS has been thoroughly demonstrated by scientists, denialists either reject the existence of HIV altogether, or cast it as a harmless virus that doesn’t cause illness. Denialism often relies upon rhetorical strategies that are superficially convincing but intellectually hollow, including the cherry-picking of evidence, appeals to unreliable “experts,” and untestable claims. Denialists also might cite early AIDS research from the mid-1980s while ignoring more up-to-date findings and improved medical procedures. Such rhetoric creates a sense of legitimate debate in an area where there is none, and the only new evidence welcomed into the discourse is that which confirms preconceived notions.

Health decisions must be shaped by the best available evidence, and when denialism misinforms, one cannot make an informed decision.

If AIDS isn’t caused by HIV, what do denialists claim is behind the unique symptoms that characterize it? Some say that conditions such as malnutrition, or diseases that have been around for a long time, are simply being labeled as AIDS. Other denialists cast antiretroviral drugs as the cause, rather than the preventive treatment, of AIDS. Some claim that AIDS is caused by behavior, such as drug use or promiscuity — with some even saying that an accumulation of semen in the anus can cause AIDS. None of the claims is true — while AIDS can leave someone vulnerable to a wide variety of diseases, and while sharing IV equipment and engaging in unprotected sex can increase risk, there is only one cause: HIV. Continue reading →

STD Awareness: 10 Myths About Sexually Transmitted Diseases

Posted on February 28, 2013 by Anna

The Internet is brimming with contradictory claims about sexual health, and you don’t know what to believe. Your friends give you advice, but you’re not sure if it sounds right. To make things worse, you might not have had evidence-based, medically accurate sex education in your school. In this edition of our STD Awareness series, we’ll take on a few myths about sexually transmitted diseases to help you sort fact from fiction.

1 MYTH: You can tell if someone has an STD by looking at them.
You might expect that if someone has an STD, their genitals would have blisters, warts, or noticeable discharge. But your partner looks fine, so you might think there’s no need to ask when his or her last STD test was.

However, while many people with STDs do have visible symptoms, they’re the exception rather than the rule. For example, three out of four women and half of men with chlamydia have no symptoms. Herpes is often spread when there are no symptoms present. Someone can be infected with HIV — and capable of transmitting it to others — and go years without showing any signs. A quick visual inspection can’t tell you very much about someone’s STD status.

2 MYTH: You can’t get an STD from oral sex.
While it is generally true that oral sex presents less of a risk for contracting STDs, this risk is not trivial. Most STDs can be passed along by oral sex, including chlamydia, gonorrhea, syphilis, hepatitis B, herpes, human papillomavirus (HPV), and HIV. You can reduce your risk by using barrier methods like condoms and dental dams consistently and correctly.

3 MYTH: Condoms can’t prevent the spread of HIV.
Many proponents of abstinence-only education state that condoms don’t protect against HIV, claiming that latex condoms have holes that are large enough for viruses to pass through. This claim isn’t backed by evidence. An intact latex condom dramatically reduces your risk of being exposed to sexually transmitted viruses such as HIV. (It is true that a lambskin condom does not provide adequate protection against HIV.) Continue reading →

How Does HIV Cause AIDS?

Posted on December 12, 2012 by Anna

diagram of a human immunodeficiency virus

Last week, we gave a general background of human immunodeficiency virus (HIV), the virus that causes AIDS by destroying the immune system. But how is HIV able to disable our immune systems so effectively, anyway? The answer lies in its structure.

HIV, just like any other virus, is made up of a tiny capsule with a small piece of genetic code inside. While most viruses we’re familiar with store their genes on a molecule called DNA, HIV contains two pieces of RNA, which is another type of gene-storing molecule. The HIV capsules also contain an enzyme called transcriptase, which “translates” the RNA into a strand of DNA that our cells can read. Our cells are then tricked into reading this DNA and producing more copies of the virus — which are then released from the host cell, at which point they are free to infect other cells. In this manner, an HIV infection slowly grows.

HIV targets our immune systems, the very mechanism that evolved to keep us safe from pathogens.

When a virus is introduced into a host’s body, immune cells pick it up and carry it to the lymphoid organs — which are a sort of meeting place for other types of immune cells, including CD4+ T helper cells (also called helper T cells). Helper T cells enlist the help of other immune cells, called killer T cells, which destroy cells infected with viruses. Helper T cells also activate the production of antibodies, molecules that are specialized to attach to a specific pathogen so that it can be destroyed. Normally, this is where the virus meets its end. Unfortunately, HIV is different from run-of-the-mill viruses in that it is specialized to invade helper T cells. Now, instead of coordinating an attack against HIV, the helper T cells have been hijacked — converted into factories for the production of yet more HIV. Continue reading →

STD Awareness: HIV and AIDS

Posted on December 5, 2012 by Anna

Our immune systems are beautiful things, refined through millions of years of evolution. The immune system’s complexity is testament to the “arms race” that has been taking place between our species and the harmful pathogens that surround us. Last century, a virus called human immunodeficiency virus (HIV) emerged, and it found a weak spot in our immune system’s armor. HIV has been exploiting this weakness ever since, and an HIV infection can eventually progress to a disease called AIDS, or acquired immune deficiency syndrome. AIDS is a condition that disables our immune system’s ability to function properly, rendering us vulnerable to a host of opportunistic infections and cancers.

Even if you don’t think you’ve been exposed, HIV testing can be a good idea.

HIV is transmitted via bodily fluids: blood, semen, pre-seminal fluid (which can be present without ejaculation), breast milk, vaginal fluids, and rectal mucus. (It can also be present in bodily fluids like amniotic fluid, cerebrospinal fluid, and synovial fluid, to which health-care workers might be exposed.) The virus is not transmitted by fluids like snot, saliva, sweat, tears, and urine — unless blood is present.

Activities that can bring you into contact with HIV-infected bodily fluids include injection drug use and sexual activities like anal, vaginal, or oral sex. It can also be transmitted to a fetus or baby during pregnancy, childbirth, or breastfeeding. In the early days of HIV, many infections occurred as a result of blood transfusions or organ transplants — though nowadays this is a rarity thanks to tissue screening. Lastly, health-care workers might be exposed to HIV through accidents involving needlesticks or cuts. Continue reading →

Get Smart About Antibiotics!

Posted on November 12, 2012 by Rebecca

This week we celebrate Get Smart About Antibiotics Week. Antibiotics, or antimicrobials as they are also called, cure bacterial infections by killing bacteria or reducing their ability to reproduce so your own body’s immune system can overcome an infection. Penicillin was the first antibiotic, and was discovered in 1924 by Alexander Fleming. Since its widespread use, beginning in the 1940s, countless lives have been saved from devastating bacterial infections. Talk about a wonder drug!

Improper use of antibiotics can have dangerous consequences.

Since then, different types of antibiotics have been developed to combat many different types of infectious bacteria. Classes of antibiotics include penicillins, cephalosporins, macrolides, fluoroquinolones, aminoglycosides, and others. In each of these classes there are lots of different individual medications. (For example, cephalosporins include the drugs cephalexin, ceftriaxone, cefaclor, and others.) Some antibiotics are broad spectrum, which means they work on many different bacteria. Some are more narrow spectrum, used for specific bacteria.

Antibiotics only work for bacterial infections … not viral infections. They are ineffective at killing viruses. Viral infections include colds, flu, runny noses, most coughs and bronchitis, and sore throats unless they are caused by strep. Sexually transmitted viruses include human papillomavirus (HPV), herpes simplex virus, and HIV. Continue reading →

STD Awareness: “What Are the Symptoms of an STD?”

Posted on October 30, 2012 by Anna

“I was treated for chlamydia, but my girlfriend feels fine, so she doesn’t need to get tested.”

“The only time I don’t use condoms is for oral sex, and everything’s been OK ‘down there,’ so getting tested for sexually transmitted diseases would be pointless.”

It’s important to be able to recognize the symptoms of a sexually transmitted disease (STD). Being savvy about symptoms can push you to get tested right away if you notice that something is amiss. However, being symptom-free can lull you into a false sense of security, especially if you’ve engaged in sexual activities that could have exposed you to an infectious agent. The fact of the matter is that many people with STDs have no symptoms at all. As they say, “The most common symptom of an STD is … no symptom.” Let’s take a look at some common STDs.

The most common symptom of an STD is no symptom.

Bacterial Infections

Bacterial STDs are curable with antibiotics. They include chlamydia, gonorrhea, and syphilis — all of which can be asymptomatic, and all of which can have severe complications when they are not treated in time.

Chlamydia: Around 3 million Americans are infected with chlamydia annually, and the infection is especially common among young people (less than 25 years of age). Chlamydia can infect the penis, vagina, cervix, anus, urethra, eye, or throat. You can be afflicted with a range of symptoms: pain or a burning feeling while urinating; vaginal, cervical, or penile discharge; swelling around the anus, testicles, or vagina; and more.

However, you’re much more likely not to experience any symptoms at all — most people with chlamydia are unaware they have it. Three out of four women with chlamydia have no symptoms, and half of men with chlamydia have no symptoms. Left untreated, chlamydia can become a serious health threat. Long-term complications might lead to fertility problems and arthritis. Continue reading →

Mexico, the United States, and HIV: It’s Complicated

Posted on October 15, 2012 by madelaineelizabetharchie

During my last semester of college, I took an Introduction to Chicana Studies class in which I read a lot about HIV transmission between the United States and Mexico. In the book we used, Latina Activists Across Borders, activists in Michoacán argue that women are infected with HIV by men who migrate to the United States and then bring it back to Mexico. While there is a lot of truth to that, the way our two countries interact on this issue is a little bit more complicated.

We need to have a more complex conversation about migration and HIV/AIDS than the one we’re having.

Often, HIV is constructed as something that is spread between “immoral” people. When it comes to transnational transmission, the country the disease comes from is seen as “immoral” or “dirty.” In the United States, we have just as many beliefs about HIV coming into the country from Mexico as the other way around. But who is right?

The answer — both/neither. Less than 1 percent of the adult Mexican population is HIV positive — that’s half the rate in the United States. According to USAID, population mobility is a big factor in HIV transmission. In Tijuana and Juarez, where HIV/AIDS rates are the highest, a large part of the population comes from South America and southern parts of Mexico. In Zacatecas and Michoacán, more than 1 in 5 people who has AIDS had lived in the United States prior to infection. Continue reading →

STD Awareness: Sexually Transmitted Diseases and Pregnancy

Posted on August 21, 2012 by Anna

Every month since January 2011, we’ve been sharing installments of our STD Awareness series, and each month, we’ve encouraged you to protect yourself from sexually transmitted diseases (STDs) by using dental dams and condoms. But what if you’re trying to get pregnant? In that case, you’re probably not using condoms! However, it is very important that partners know their STD status — being screened and treated for STDs prior to pregnancy is a good idea for your health, and can protect your future baby.

If you and a partner are trying to get pregnant, you might consider being screened for STDs together.

When present during pregnancy, certain STDs can have negative health effects for you or your future baby (including preterm labor, stillbirth, low birth weight, pneumonia, certain infections, blindness, and liver disease), especially if they are not cured or treated in time. Receiving prenatal care can help prevent these problems, so it is important to be screened and treated for STDs prior to or early in your pregnancy.

During pregnancy, the immune system undergoes changes, which are probably necessary to ensure that the body doesn’t reject the fetus — normally, the immune system recognizes non-self cells as potential pathogens and attacks. These immune system changes might make a pregnant person more susceptible to disease. Latent viral infections, like genital warts or herpes, might come out of dormancy. Additionally, anatomical changes lead to a larger exposed area of the cervix, which is potentially more vulnerable to initial infections. Continue reading →

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