11.   About half of all new cases reported last year had been infected through heterosexual contact, while a quarter were through homosexual contact.

12.   AIDS is a serious health problem in many parts of Africa, where it is transmitted primarily through heterosexual contact.

13.   AIDS is spread mostly through heterosexual contact in southern Africa.

14.   But Zhang said that sexual contact, especially heterosexual contact, had become the predominant route of transmission.

15.   HIV is spread mostly through heterosexual contact in Africa, where traditional patriarchic societies reject the use of condoms and condone multiple sexual partners for men.

16.   In Africa, AIDS is mostly spread by heterosexual contact and contaminated blood.

17.   In Africa, AIDS is spread mainly by heterosexual contact in polygamous societies and contaminated blood products, needles and razors.

18.   In Africa, where traditional polygamy and promiscuity persist, AIDS is spread mainly by heterosexual contact.

19.   In Africa the disease is spread through heterosexual contacts.

20.   In Africa, AIDS is mainly spread by heterosexual contact and contaminated blood.