| H.I.V Study Find Rates 40% Higher Than Estimated |
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MEXICO CITY — The United States has significantly underreported the number of new H.I.V. infections occurring nationally each year, with a study released here on Saturday showing that the annual infection rate is 40 percent higher than previously estimated. The study, conducted by the Centers for Disease Control and Prevention, found that 56,300 people became newly infected with H.I.V in 2006, compared with the 40,000 figure the agency has cited as the recent annual incidence of the disease. The findings confirm that H.I.V., the virus that causes AIDS, has its greatest effect among gay and bisexual men of all races (53 percent of all new infections) and among African-American men and women. The new figures are likely to strongly influence a number of decisions about efforts to control the epidemic, said the disease centers’ director, Dr. Julie L. Gerberding, and other AIDS experts. Timely data about trends in H.I.V. transmission, they said, is essential for planning and evaluating prevention efforts and the money spent on them. Dr. Gerberding said the new findings were “unacceptable,” adding that new efforts must be made to lower the infection rates. “We are not effectively reaching men who have sex with men and African-Americans to lower their risk,” she said. Dr. Kevin A. Fenton, who directs H.I.V. prevention efforts at the agency, said, “C.D.C.’s new incidence estimates reveal that the H.I.V. epidemic is and has been worse than previously known.” A separate historical trend analysis published as part of the study suggests that the number of new infections was probably never as low as the earlier estimate of 40,000 and that it has been roughly stable overall since the late 1990s. C.D.C. officials said the revised figure did not necessarily represent an increase in the number of new infections but reflected the ability of a new testing method to more precisely measure H.I.V. incidence and secure a better understanding of the epidemic. Dr. Philip Alcabes, an epidemiologist at Hunter College in Manhattan, raised questions about the validity of the findings. If they are true, Dr. Alcabes said in a statement, the agency has undercounted new H.I.V. infections by about 15,000 per year for about 15 years. “Therefore, there are roughly 225,000 more people living with H.I.V. in the U.S. than previously suspected,” he said. “The previous estimate was 1 million to 1.1 million.” A C.D.C. spokeswoman said Dr. Alcabes’s estimates were incorrect because the new figures could not be used to calculate the total number of people with H.I.V. The C.D.C. does not know the total number but is expected to determine it later in the year. The C.D.C., the federal agency responsible for tracking the AIDS epidemic in the United States, said its new monitoring system provided more precise estimates than were previously possible of new infections in specific populations. Infection rates among blacks were found to be seven times as high as for whites (83.7 per 100,000 people versus 11.5 per 100,000) and almost three times as high as for Hispanics (29.3 per 100,000 people), a group that was also disproportionately affected. The C.D.C. has known of the new figures since last October, when the authors completed a manuscript and sent it to the first of three journals. But the agency refused to release the findings until they were published in a peer-reviewed medical journal. The first two journals rejected the authors’ request for a fast-track review. The paper is being published in the Aug. 6 issue of The Journal of the American Medical Association. The journal and the disease centers had planned to release it at a news conference on Sunday at the opening of the 17th International AIDS Conference here. But the paper was released on Saturday because the embargo was broken. A number of leading health experts have criticized the agency for not releasing the information earlier. On Nov. 21, C.D.C. officials told AIDS advocacy groups and reporters that the data would be released soon. In an editorial on June 21, The Lancet, an internationally prestigious journal published in London, severely criticized the disease centers for failing to release the information and said, “U.S. efforts to prevent H.I.V. have failed dismally.” Dr. Gerberding, in defending the decision not to release the data earlier, said: “This paper has been scrutinized by some of the best statisticians in the country and is much better now than when we started this process. It was so complicated that even I, who has some expertise in this area, could not stand by it without making sure we had gone through the review process.” |