1. Receptive penile-vaginal intercourse-10 transmissions in 10000 cases
Insertive penile-vaginal intercourse-5 transmissions in 10000 cases
These results are much less than blood transfusion transmission, but can happen at the estimated rate.
2. Without treatment, about 9 out of every 10 persons with HIV will progress to AIDS after 10-15 years. Many progress much sooner.
3. There are no typical symptoms. AIDS infection is suspected if so called opportunistic infections appear more than usual. An opportunistic infection is an infection caused by pathogens only if the immune system is compromised. The set of symptoms varies for each pathogen. Detecting some of the opportunistic pathogens as cause for the infection is usually enough to rise suspicion for probable HIV infection.
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