Are all the underlined words in the text and all the highlighted punctuation marks correctly used? Is the entire text comprehensive enough?

Are all the underlined words in the text and all the highlighted punctuation marks correctly used? Is the entire text comprehensive enough? Please help me. How can I make the word 'using' in the last paragraph not redundant?

Adela, the resource speaker in our seminar, talked about HIV/AIDS, its symptoms, and the preventive measures against it. She pointed out that HIV attacks the body’s immune system, and if untreated, it reduces the number of CD4 cells (T cells) in the body, making one more prone to other infections. She stated that according to the World Health Organization (WHO), the Arab region has the world's fastest growing epidemic.

"The symptoms of HIV vary, depending on the person and the stage of the disease he/she is in: the early stage, the clinical latency stage or chronic HIV infection, or AIDS as the late stage of HIV infection,” she elaborated. She said that in the early stage of HIV, one can experience flu-like symptoms, such as fever, chills, rash, night sweats, muscle aches, sore throat, fatigue, swollen lymph nodes, and mouth ulcers, that in the clinical latency stage, one may not have any HIV-related symptoms, or only mild ones, and that in the late stage of HIV infection, one may experience symptoms, such as rapid weight loss, recurring fever or profuse night sweats, extreme and unexplained tiredness, prolonged swelling of the lymph glands in the armpits, groin, or neck, diarrhea that lasts for more than a week, sores of the mouth, anus, or genitals, pneumonia, red, brown, pink, or purplish blotches on or under the skin or inside the mouth, nose, or eyelids, memory loss, depression, and other neurological disorders.

HIV/AIDS, she further said, spreads primarily by having unprotected sex with an infected perso, having multiple partners, being stricken with other sexually transmitted diseases (STDs), sharing needles, syringes, rinse water, or other equipment used to prepare illicit drugs for injection, or being born to an infected mother. She noted that there is no cure for HIV/AIDS, but that there are medications that can slow down the progression of the disease. She stressed the significance of preventive measures against the disease, such as having sexual intercourse within a long-term, mutually monogamous sexual relationship with an uninfected partner, using male latex condom, and using clean needles.