Important note: Information in this article was accurate in 1988. The state of the art may have changed since the publication date.
LOS ANGELES TIMES (LT) - MONDAY October 3, 1988 Edition: Home Edition Section: Metro Page: 3 Pt. 2 Col. 1 Word Count: 328
Janny Scott; Times Medical Writer
The number is an indicator of how many people will develop AIDS. As such, it influences levels of funding for research, education and services. Some people contend that current levels are far too low; others suggest that the epidemic is being exaggerated.
Last week, the federal estimate of 945,000 to 1.4 million HIV-infected Americans came under question once again. Joel W. Hay, a health economist at the conservative Hoover Institution, called the federal figure too high by far. His estimate: 500,000 to 800,000 infected.
Hay's figures came five weeks after analysts from another think tank, the Hudson Institute in Indianapolis, announced that they believed the government figures are too low by half. Their figure: Between 1.9 million and 3 million.
One month before that, the New York City Health Department halved its estimate of the number of infected city residents from 400,000 to 200,000. The decision prompted protesters to occupy the health commissioner's office and picket his apartment house.
At issue here are the assumptions used in the mathematical models used to estimate the numbers of people infected--models that can extrapolate from the number of people being diagnosed with AIDS each year to determine how many more might be infected.
Those models require many assumptions about such things as how many gay men there are in the population and how fast the virus is spreading. The models are limited by uncertainty about modes of transmission, human behavior and the natural history of the virus.
"You have to make assumptions on all this," said Dr. Timothy J. Dondero, chief of the seroepidemiology branch of the Centers for Disease Control. "That's where the differences in opinion come out--what's the most reasonable assumption? Because nobody knows the truth."
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