Australia has given the green light to the world’s first vaccine designed to protect endangered koalas from chlamydia, a disease that has severely affected wild populations of the species.

US Health Secretary Robert F Kennedy Jr, a vaccine sceptic, has removed all 17 members of a committee that issues official government recommendations on immunisations.

Doctors have started testing the world's first mRNA vaccine for lung cancer, a development experts are calling "groundbreaking" for its potential to save thousands of lives.