In the UK, 33,000 people are now living with the HIV virus - the highest levels ever.
These numbers are expected to increase by fifty per cent in the next five years.
So be sure to browse through the entire letter section if you are unsure of the exact patent date for the patentee in question.
Older people in the United States are more likely than younger people to have late stage HIV infection at the time of diagnosis, which means they start treatment late and possibly suffer more immune-system damage.
Most of us assume the threat of Aids is a million miles away.
But a new report has revealed the illness has now reached its highest levels ever across Europe - and is spreading more rapidly here than anywhere else in the world.
In fact in Britain now, more than half of those people with the virus are heterosexual.
Five thousand of those affected in Britain are women, many of whom are teenagers or in their early thirties.
Although there is a higher prevalence of HIV among the gay community and African communities, the cold truth is that women are more vunerable to HIV infection than heterosexual men, claim experts.
This is because it can take up to ten years before the virus kills off our white cells - the cells responsible for maintaining our immune system. Finally, keep abreast of up-to-date information about the disease, there's plenty of advice out there.
The entries in this volume are grouped alphabetically by first name of Patentee's surname.
Many older people are sexually active, including those living with HIV, and may have the same HIV risk factors as younger people, including a lack of knowledge about HIV prevention, as well as having multiple sex partners.
Older people also face some unique issues: Stigma is a particular concern among older people because they may already face isolation due to illness or loss of family and friends.