Health experts warned cases of HIV/AIDS are continuing to rise, with 843 cases being treated in Lancashire over the last year.
The figures for the county have risen by 35% in the past four years.
However there were fewer new cases in 2009 than in 2008 – 106 compared to 110 – according to latest figures from the Centre for Public Health at Liverpool John Moores University and the Health Protection Agency (HPA).
In the North West, 43% of infections in people new to HIV services in 2009 were acquired in the UK, and, of these infections, 74% were acquired through sex between men.
A total of 41% of patients said they acquired the infections outside the UK and 80% of those were acquired through heterosexual sex.
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