Dale Lawrence’s research into AIDS incubation gained a more pressing import. With an average incubation period of 5.5 years, there didn’t have to be many cases in 1984 to substantiate the fatality of the AIDS virus. According to his calculations, because the virus had not invaded the bodies of very many Americans until 1980, the huge number of AIDS cases would not start appearing until late 1985. Still, throughout 1984, the CDC made no effort to reveal Lawrence’s disquieting research.