You really like blaming the US for everything. However please try looking up facts instead of using your default answers.
https://link.springer.com/chapter/10.1007/978-0-387-75722-3_9
AIDS in China
In June of 1985, an Argentine–American tourist was hospitalized in Beijing’s Xiehe Hospital with a pulmonary infection and subsequent respiratory failure. During his hospitalization, he was diagnosed with PCP and AIDS, thereby becoming the first person to be diagnosed with HIV in China (First AIDS case, 2001).
In the same year, four hemophiliacs in Zhejiang province tested positive for anti-HIV antibodies (Zhejiang HIV/AIDS patients, 2005). After ruling out other risk factors such as risky sexual contact, intravenous drug use, and mother-to-child transmission,
it was determined that all four people had received Factor VIII treatment in which imported HIV-contaminated products were used. This revelation raised the likelihood that HIV had entered China before 1985.
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The first Chinese AIDS cases were caused by China not having an adequate domestic Hemophilia program so they imported blood products from outside China and some were tainted with AIDS.
I'm sure American blood products would be expensive and African ones (where AIDS first appeared) very cheap. So now you know what happened. Regular tourism to China was not big in the 1980's. However Shenzen back then was world famous with its "special economic zone" as a hub for Sex Tourism with its cheap prostitution so it is always possible AIDS started there.
That is just a theory put forth in 2003...out of many including a Chinese origin one.
https://en.wikipedia.org/wiki/Spanish_flu#Hypotheses_about_the_source
The major troop staging and hospital camp in
Étaples, France, was identified by researchers as being at the center of the Spanish flu. The research was published in 1999 by a British team, led by
virologist John Oxford.
[20] In late 1917, military pathologists reported the onset of a new disease with high mortality that they later recognized as the flu. The overcrowded camp and hospital was an ideal site for the spreading of a respiratory virus. The hospital treated thousands of victims of chemical attacks, and other casualties of war. 100,000 soldiers were in transit through the camp every day. It also was home to a live
piggery, and
poultry was regularly brought in for food supplies from surrounding villages. Oxford and his team postulated that a significant precursor virus, harbored in birds,
mutated and then migrated to pigs kept near the front.
[21][22]
There have been claims that the epidemic originated in the United States. Historian
Alfred W. Crosby claimed that the flu originated in
Kansas,
[23] and popular author
John Barry described
Haskell County, Kansas, as the point of origin.
[15] It has also been claimed that, by late 1917, there had already been a first wave of the epidemic in at least 14 US military camps.
[24]
Earlier hypotheses put forward varying points of origin for the epidemic. Some hypothesized that the flu originated in
East Asia, a common area for transmission of disease from animals to humans because of dense living conditions.
[25] In 1993, Claude Hannoun, the leading expert on the 1918 flu for the
Pasteur Institute, asserted the former virus was likely to have come from China. It then mutated in the United States near
Boston and from there spread to
Brest, France, Europe's battlefields, Europe, and the world with
Allied soldiers and sailors as the main disseminators.
[26] He considered several other hypotheses of origin, such as Spain, Kansas and Brest, as being possible, but not likely.
Political scientist
Andrew Price-Smith published data from the
Austrian archives suggesting the influenza had earlier origins, beginning in Austria in early 1917.
[27]
In 2014, historian Mark Humphries argued that the mobilization of 96,000
Chinese laborers to work behind the British and French lines might have been the source of the pandemic. Humphries, of the
Memorial University of Newfoundland in
St. John's, based his conclusions on newly unearthed records. He found archival evidence that a respiratory illness that struck northern China in November 1917 was identified a year later by Chinese health officials as identical to the Spanish flu.
[28][29] A report published in 2016 in the Journal of the
Chinese Medical Association found no evidence that the 1918 virus was imported to Europe via Chinese and Southeast Asian soldiers and workers. It found evidence that the virus had been circulating in the European armies for months and possibly years before the 1918 pandemic.
[30]