The Vatican yesterday defended Pope Benedict's opposition to the use of condoms to stop the spread of AIDS as activists, doctors and politicians criticised it as unrealistic, unscientific and dangerous.

Benedict, arriving in Africa, said on Tuesday that condoms "increase the problem" of AIDS. The comment, made to reporters aboard his plane, caused a worldwide firestorm of criticism.

"My reaction is that this represents a major step backwards in terms of global health education, is entirely counter-productive, and is likely to lead to increases in HIV infection in Africa and elsewhere," said Prof Quentin Sattentau, Professor of Immunology at Britain's Oxford University.