Frieden targeted gay men in particular: "It's a wake up call to men who have sex with men, particularly those who may use crystal methamphetamine. Not only are we seeing syphilis and a rare sexually transmitted disease -- lymphogranuloma venereum -- among these men, now we've identified this strain of HIV that is difficult or impossible to treat and which appears to progress rapidly to AIDS."
The press reaction was swift and predictable: "AIDS Super Bug," blared the NY Post; "rare and deadlier form of AIDS," read the NY Times. Soon it was on CNN and the nightly news. "A frightening, never-before-seen 'superstrain' ... full-blown AIDS sets in with lightning speed." "New AIDS Peril Puts America on High Alert," announced The Hindu and other international papers. Yet accounts of the "superstrain" were mostly superficial.
Hotlines at AIDS service organizations began buzzing with anxious questions: Does this mean my HIV test was no good? Does this mean my drugs won't work anymore? People were certainly talking, but what was the hubbub about?
Chatter on the e-mail networks of people who follow AIDS research immediately zeroed in on one glaring detail: This was only one case. An unusual and tragic set of circumstances, no doubt, but, so far, found in just one person. If there had been a cluster of several cases where people were progressing to AIDS with a highly virulent strain of untreatable HIV -- that would have been big news. But did a single case warrant a press conference that launched headlines around the world? As the story filtered out, some pieces began to fall into place.
But this patient had a virus that was resistant to drugs in three of the four classes of antiretrovirals. Wasn't that alarming? Well, it should be, but it is not uncommon. Studies have found resistance to at least one drug in 6 to 15 percent of recently infected people. Even triple-class drug-resistant HIV was found to be transmitted in about 1.3 percent of new infections in one study. At the Retrovirus conference, several clinicians commented that they had a number of patients with this extent of resistance.* Among people who already have been on therapy, studies have found at least one resistance mutation in nearly 80 percent of those with detectable viral load.
Frieden claims it was the unprecedented combination of rapid progression with transmitted multi-drug resistance that justified the alert. But even this was not unique. In 2001, Julio Montaner of Vancouver, BC reported on two cases of multi-drug resistance in patients who had rapidly progressed to AIDS. Clearly this situation had been seen before -- and the sky didn't fall in -- so what possessed Frieden to unleash a torrent of fear and confusion over this case? Had he been duped by the fame and authority of Dr. Ho? Was it all orchestrated by Dr. Ho's public relations firm, the Corkery Group? Was he so naive as to think the global press wouldn't whip this story into a superheated frenzy? Or did the aggressive commissioner have an agenda of his own and saw in this case an opportunity to shake up New York's complacent gay community about the unabated AIDS crisis among them?
New Yorkers could use a wake up call. Gay men continue to lead the categories of the newly infected in New York and alcohol and methamphetamine use have been shown to strongly increase one's risk of infection. Take this individual: How can it be that a gay man remains uninfected until his mid-40s then stumbles in such a dramatic way? Unfortunately, there is nothing at all unique about this aspect of his case. Not enough attention has been given to mid-life gay men and the stress they experience. But with shrinking federal funds for prevention and a shifting emphasis towards secondary prevention (prevention efforts aimed at infected people in a medical context, an approach lately promoted by the CDC as they retreat from funding prevention in high risk groups) and away from primary prevention education for people at risk (youth, women of color, and amphetamine users, etc.), men like this are less likely than ever to have somewhere to turn for help.
HIV is relatively difficult to transmit sexually, although certain practices such as unprotected anal intercourse can increase the risk greatly. Once acquired, HIV is normally a slow moving disease. A person who is newly infected may not realize it, or may have symptoms of acute infection that range from muscle aches to a dramatic rash and flu-like symptoms. After the initial stage of infection, an individual's immune system usually kicks in to bring the HIV under partial control. But HIV replicates rapidly -- a new generation is born nearly every day -- so within a few weeks of settling into its new host, the virus is evolving and beginning to escape immune control. By the time a year has passed, the dominant virus may be quite different from the virus a person received at infection, having gone through the equivalent of 6,000 years of human evolution. Antiretroviral (ARV) therapy can knock down the HIV replication rate to nearly -- but not quite -- zero. There are always a few cells hanging around that hold some virus in reserve. If the drugs are interrupted or stretched too thin, these few viruses will start to increase in number. The longer virus is allowed to replicate in the presence of the drugs, the more likely that one of them will produce a random mutant capable of thriving despite them. Before long, if this keeps up, a drug-resistant strain is born. The fact is, most people with multi-drug resistance have made it themselves.
The best guard against resistance is to maintain strict adherence to effective medication, but it's hard to do. The DOT approach, from the TB world, has been successfully used to administer HIV drugs as well. But TB is curable within months, while HIV requires life-long treatment. Studies of ARV therapy in prisons have produced excellent levels of adherence and viral suppression. But it should be obvious that such means are not solutions for this situation.
The terms "superbug" or "superstrain" are sensational words invented by the media to sell newspapers. But there are a couple of other "super" terms that have been conspicuously missing from discussions about the New York patient. One is "super-spreader," an informal epidemiological term used to describe an individual who is responsible for a high number of transmission events in a population. Recently infected people typically have extremely high viral loads. They may also have a virus that is well-adapted to transmission -- after all, it was recently transmitted to them. Put this person in a social setting where he is bingeing on drugs and unprotected sex with multiple partners in weekend-long parties and he will be much more likely to infect other people than a party pal with a relatively tame chronic infection. The Hollywood horror angle to this scenario is that the "super-spreader" may have no idea he is infected.
Maybe this is who Tom Frieden really wants to reach. If you can diagnose people when they are most infectious, then perhaps the unrelenting cycle of HIV transmission among gay men can be arrested and reduced. For someone who has tackled outbreaks of TB, it makes sense. But will it work for HIV? By the time someone has visited a doctor with symptoms of primary HIV disease and has been confirmed positive, the most infectious phase is nearly over. So the disease detectives from the Department of Health hit the streets to find anyone our superspreader may have infected (they also want to find out who infected him and trace those contacts as well). If they can reach one of his infected contacts early enough then maybe the superspreader cycle can be broken. It's certainly worth a try. But when partners are anonymous or dimly recalled after drug-fueled lost weekends, it may be tough to make the connections. In the case of the New York patient, the word is that two of the people who may have infected him have been contacted, and one is cooperating with the health agency.
But HIV-negative people are not the only ones at risk. Another unspoken "super" in all of this is "superinfection." This is a much misunderstood medical term for acquiring one HIV infection on top of an existing infection (super, in Latin, means "above," not "faster-than-a-speeding-bullet"). Re-infection might be a less loaded term. Some people in the HIV community absolutely deny the possibility of superinfection, probably because it threatens a perceived freedom to have unprotected anal intercourse with other positive people, a practice called serosorting. There are theories and a few persuasive studies that say having HIV is protective against infection with a different strain of HIV. Nevertheless, there is incontrovertible proof that superinfection does occur. The worst case scenario, of course, is if a person on ARVs with fully suppressed HIV becomes re-infected with an untreatable, multi-drug resistant strain of HIV that takes over and plunges him into AIDS. Superinfection has been convincingly detected in several individuals and in a few longitudinal studies. The question now is how often, how likely, and how clinically relevant these events are. One study described at the 12th Retrovirus Conference calculated that re-infections may occur as often as initial infections. So, a multi-drug resistant strain of HIV being passed around is a potential problem for both negative and positive people.
One new tactic Frieden is taking to tackle resistance is to demand that every diagnostic laboratory in the country notify his department whenever a multi-drug resistant specimen turns up that has originated in New York City. They have asked labs to be on the lookout for not only the specific strain (the technical term is quasispecies) that caused the panic, but also for every instance of HIV with a more broadly defined set of resistance mutations. At the very least, this should soon give an indication of whether this particular virus is a cause for concern or a virological oddity. Beyond that, it will add interesting information about the prevalence of drug resistance in New York to what we know from other sources. But how will this help prevent new infections? If the disease detectives are not swamped with processing the reports, they may hit upon a recent seroconverter and make an effective intervention. But these are people who should be the focus of prevention efforts anyway, whether they have acquired a drug-resistant strain of not. A better way to reach these people, it seems, is to create more opportunities to access medical care, train more doctors to suspect HIV, take better sexual histories and perform more tests. This will require resources and education.
So, was this virus really that special? Almost all transmitted viruses use the CCR5 coreceptor to gain entry to a new host cell. CCR5-using HIV is most commonly found during the early years of infection, but in some people, the virus eventually switches and begins to use another coreceptor, CXCR4. The switch to using CXCR4 is associated with a much more rapid loss of CD4 cells and progressive disease. Ominously, the New York patient appeared with a virus that could use CXCR4 only a few weeks after his infection. Also, it is generally thought that drug-resistant HIV is less capable of replication than the wild type and therefore more difficult to transmit. But this virus had a replication capacity equal to or better than the average wild-type virus. These facts, more than the drug resistance, make this a curious and unsettling case.
While Frieden put most of the emphasis on the viral "strain," most HIV scientists who heard about the patient that Friday afternoon immediately thought the explanation likely lay with the person. "More often than not, (rapid progression) has something to do with the person infected; not the virus itself," said Anthony Fauci, perhaps the only AIDS scientist better known than Dr. Ho. Some people are more genetically susceptible to HIV and disease progression than others. Yet of the 20 or so immunological characteristics known to be associated with AIDS onset, this person had none. That does not mean that some other factor wasn't responsible. New interactions between the host and the virus are reported almost every month. One telling aspect to this case was that the patient apparently failed to mount any significant immune challenge to the infection and that his CD8 cell count fell along with his CD4 count. But again, there is no way of knowing if this was due to the virus or the person.
Some people initially speculated that crystal meth had played a role in wearing down his immune system or somehow revving up the virus. But there is nothing solid in the medical literature that points to this, although the patient's reported 20 pound weight loss during that period might just as well be attributed to crystal meth use as to AIDS.
So, agendas aside, there were some strikingly unusual and alarming aspects to this case. It certainly must have seemed that way to Martin Markowitz, the researcher at Aaron Diamond who evaluated the patient. After the story broke and criticism began swirling about the decision to go public, Markowitz spoke before a group of New York physicians, where he described the patient and distributed a draft of an op-ed piece he had written about the new strain, which he compared to "a silent tsunami." An attendee at the meeting recalled that the researcher was adamant about the significance of the case and accused the doctors of "looking for a horse" when faced with a stampeding "herd of zebras." Markowitz subsequently attended the Retrovirus Conference, where a special session had been called to discuss the case, but left the presentation to Dr. Ho, who, it became clear, had been unaware of many details of the case (such as whether the individual had ever injected methamphetamine or not -- we were later told he hadn't).
So the question remains: Is this case the tip of the iceberg of some new, highly virulent strain of HIV that is spreading even as you read this? Or was it a perfect storm involving an unusual (but hardly unique) case that became super-sized by runaway imaginations, inflated egos, political opportunism and a gullible press? Was the brouhaha over this individual simply a heavy-handed way of getting the attention of New York's doctors and at-risk communities? Dr. Frieden and other health department representatives have repeatedly said it would have been irresponsible not to announce the case.
Whatever the merits of the decision to launch this story around the world, the fact is that, in New York at least, a few more people are talking about HIV and the reality that gay men still become infected every day. Hopefully, some are learning that adherence can prevent drug resistance and that condoms can prevent new infections. But with all the noise about this virus, how many ever learned about the symptoms of primary HIV infection?
One wonders: if this particular virus of mass destruction does not exist, would it have to be invented as a pretext for a renewed war on AIDS? If the only way to get the gay community's attention is by hitting us in the head with the two-by-four of a super virus, then do the ends justify the means? I suppose it depends on what comes of all this. Fear has never been demonstrated to be a sustainable prevention aid. Most agree that clear information and enlightened self interest work better. Dr. Frieden has stimulated some discussion here in New York, and he may uncover some interesting facts about drug resistant HIV in the city as well. Hopefully, this will all result in a net reduction of new infections when his department reports their HIV incidence numbers next year.
|"Super Virus" Timeline|
Mid 40s, gay male living in New York City