Definition of HIV
HIV is a virus, which progressively evolves, the ultimate stage being AIDS. It attacks the cells of the immune system (T4 or CD4 lymphocytes) and gradually destroys them. If left untreated, serious illness can occur.

Transmission
During unprotected sex with an infected person through semen, blood, vaginal secretions, and pre-ejaculatory fluid.
Through blood: Through needle sharing among injection drug users.
Mother-to-child transmission in-utero and through breast milk.
TREATMENTS
Definition of Hepatitis C
Hepatitis is an inflammation of the liver, most often caused by a viral infection. There are several types of hepatitis. Hepatitis C (HCV) is a virus that is transmitted mainly through the blood and damages the liver. It can live in the open air for more than 7 days

Transmission
Hepatitis C is transmitted mainly through blood. During injections with contaminated needles or injection equipment.
Tattoos and piercings with non-sterile equipment.
Through sharp objects (razors, toothbrushes, tweezers, clippers).
Through sharp objects (razors, toothbrushes, tweezers, clippers).
Accidental puncture wounds with contaminated equipment. Mother-to-child transmission (when the mother is infected). Treatment
TREATMENTS
Definition of Syphilis
Syphilis is a sexually transmitted disease (STD) that can lead to very serious complications when left untreated, but it is simple to cure with the right treatment. Syphilis spreads from person to person via skin or mucous membrane contact.

Transmission
Through contact with a syphilis sore during vaginal, anal or oral sex. Sores are found on or around the penis, vagina or anus, or in the rectum, on the lips or in the mouth.
Stages and symptoms
Syphilis is divided into stages with different signs and symptoms associated with each stage. A person with primary syphilis usually has a sore or sores at the site where the infection originated. These sores are usually (but not always) firm, round and painless. Signs and symptoms may not be noticed.