He said the message is to get regularly tested and practice safe sex.
The rate of Gonorrhoea diagnoses has also increased with a rate of 21 per 100,000 in 2016 compared to 12 in 2015 in Blackburn with Darwen and 28 per 100,000 in Lancashire in 2016 and 2015.
The borough had the highest Chlamydia detection rate in the North West in 2016, data released by Public Health England shows.
“One of the problems historically was an ever increasing number of infections that were not being diagnosed until they went on to get other diagnoses.”
Figures show in Blackburn with Darwen there was a new diagnosis rate of 957 per 100,000 residents in 2016 compared to 792 per 100,000 in 2015 for all STIs while in Lancashire it was 668 per 100,000 residents in 2016 and 702 in 2015.
“People can have infections from a long time ago and not know about it because it is asymptomatic.”
“A rise in detection is a good thing even though it looks like it is not. Because we have more diagnoses it is a sign of a good screening programme.