A May 3 Page One article about a new strain of tuberculosis incorrectly said that the disease is caused by a virus. It is caused by a bacterium.
Virulent New Strain of TB Raising Fears of Pandemic
Thursday, May 3, 2007
MOSCOW -- A virulent strain of tuberculosis resistant to most available drugs is surfacing around the globe, raising fears of a pandemic that could devastate efforts to contain TB and prove deadly to people with immune-deficiency diseases such as HIV-AIDS.
Known formally as extensively drug-resistant TB, or XDR-TB, the strain has been detected in 37 countries. It arises when the bacterium that causes TB mutates because antibiotics used to combat it are carelessly administered by poorly trained doctors or patients don't take their full course of medication. Rather than being killed by the drugs, the microbe builds up resistance to them.
At least 50 percent of those who contract this strain of TB will die of it, according to medical experts. In trying to stop the spread of the disease, which can be transmitted through coughing, spitting or even speaking, health officials have imposed sometimes extreme controls on infected people.
Robert Daniels, a 27-year-old dual Russian-U.S. citizen, underwent months of treatment for TB in Russia, where he often led a homeless existence. After telling people he was feeling better, he flew from Moscow to New York on Jan. 14 last year, then on to Phoenix.
In fact, his disease had not disappeared. The microbe causing it had mutated, apparently helped by his failure to complete a drug regimen in Russia. Weeks after arriving in Phoenix, Daniels was again coughing, feeling weak and losing weight.
Doctors in Phoenix diagnosed his illness as the new resistant strain of TB. Daniels again failed to follow doctors' orders, authorities say. So health officials got a court order, and he was locked up in the prison wing of a Phoenix hospital, where he has spent the past nine months in hermetically sealed isolation.
"It's not right," Daniels said in a telephone interview. "I'm not a criminal."
Daniels has become a case study in the bleak choices society faces in dealing with the new strain and attempting to balance protection of individual rights with protection of the public.
Evidence of TB has been found in ancient skeletons and mummified remains. From the 17th century to the 20th, it was a major killer in the United States and Europe, taking the lives of such notable people as the poet John Keats, the composer Frédéric Chopin, the writer Stephen Crane and the actress Vivien Leigh.
Even in the antibiotics age, TB has remained a scourge in poorer countries and communities. Today, one in three people globally is estimated to be infected with dormant TB, according to the World Health Organization (WHO). Most will never get sick, but in one in 10 cases the bacterium becomes active when the host's immune system is compromised. Worldwide, an estimated 1.7 million people die every year of the disease.
Two events last year alerted the medical community to a frightening new version of the disease. The Centers for Disease Control and Prevention, drawing on a survey of TB labs on six continents, reported that the prevalence of the super strain of TB increased from 3 percent of patients to 11 percent between 2000 and 2004. It reached 15 percent in South Korea and 19 percent in Latvia. There are no statistics yet about the new strain in Russia, China or Africa, areas with major TB populations .
In the United States, 13,767 TB cases were recorded in 2006, the lowest rate of infection since reporting began in 1953. A retrospective analysis by the CDC found 49 cases of the new strain in the country since 1993.