Word: occurance
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Dates: during 1990-1999
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...types found in Africa. Apparently, it preferred the moist mucosal tissue of the genital organs, making heterosexual transmission easier. The other variety, found in the drug abusers, appeared similar to strains detected in the U.S. and Europe. It thrived on immune cells in the bloodstream. As a result, transmission occurred through the exchange of contaminated blood, as might occur during the sharing of needles or in abrasive anal...
...mood of despair in Amsterdam last week was not shared by the small, stocky Frenchman who is one of the leading pioneers of AIDS research. By rights, Dr. Luc Montagnier ought to be alarmed by the suggestion that AIDS might occur without the HIV virus. After all, it was his team at the Pasteur Institute nine years ago that first isolated the infectious agent known...
...researchers, Roy Anderson of the Imperial College of Science and Technology in London and Robert May of Oxford, are highly respected. There are, however, legitimate questions about the study: for example, it presumes a higher level of sexual contact between older infected men and younger women than may actually occur. But even if it's accurate, some public-health officials would rather not know. Such gloomy talk, they fear, will persuade African governments to give up on much-needed family-planning programs...
Acute attacks of asthma occur when the bronchial tubes of the lungs become partly blocked. For reasons that are not entirely clear, the lungs are overstimulated by viral infections, allergens or pollutants. The body responds by activating various defense cells from the immune system. Their mobilization causes the airways to swell. At the same time, the muscles surrounding the airways contract, cutting off airflow. When that happens, asthmatics must inhale an adrenaline-like substance to stop the muscle spasm and reopen their airways...
...suicidal "cries for help" did occur, they were in the early '80s, when Diana produced two sons while emerging from her own adolescence as the world watched. At times she burst into tears at photographers' endless prying. They were, of course, quick to pick up that the couple were appearing together less and less. One reason was obvious: the ever more glamorous princess always stole the show from her awkward prince...