After a spike in sexually transmitted infections across many age groups, a Queensland sexual health nurse is urging adults to follow teenagers and carry condoms in their wallets.

The number of over-50’s contracting STIs has nearly doubled in Queensland in the last four years according to the state's health statistics.

In 2013 there were 541 cases reported in that age group compared to 2017 where there were 1,078, but when looking at the under-20’s the rate of STIs had declined from 6,440 cases in 2013 to 6,011 last year.