The HIV-positive patients recruited for the research were those who have suppressed the virus in their body through antiretroviral treatment (ART) medications.
"It is not always easy for people to get tested for HIV or find access to care; in addition, fear, stigma, homophobia and other adverse social forces continue to compromise HIV treatment", he said.
"Our findings provide conclusive evidence for gay men that the risk of HIV transmission with suppressive ART is zero", said the study's lead author, Professor Alison Rodger from the UCL Institute for Global Health.
Researchers monitored nearly 1,000 gay male couple across Europe over an 8-year period, where one partner was HIV-positive and undergoing ART and the other didn't have the virus.
The couples reported having anal sex without condoms at total of 76,088 times.
The study was conducted by a team of investigators, in collaboration with the New York City Department of Health and Mental Hygiene, and used population-based HIV surveillance data to understand if the timeliness of HIV diagnosis and antiretroviral treatment (ART) initiation improved since "universal treatment" was first recommended.
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Rachel Baggaley, the World Health Organization's coordinator for HIV prevention and testing, said this latest study "adds to the clear and consistent evidence" that HIV transmission to sexual partners does not occur when someone with HIV is on antiretroviral therapy (ART) and their virus is suppressed. When the level of virus is reduced to such low levels that they are "undetectable", there is zero chance that HIV can be transmitted.
She called for all people living with HIV to have access to testing and effective treatment.
Deborah Gold, chief executive of National AIDS Trust said more should be done to get the message out to healthcare workers and the public.
Dr Ford Hickson, from the London School of Hygiene and Tropical Medicine, said the study confirmed that if people suppress their HIV with antiretroviral therapy, they "cannot pass their virus to other people during sex, whatever kind of sex they have". Serodifferent means one partner is diagnosed with HIV while the other is not. Most recently, a group of scientists confirmed that a now available drug can help in stopping the transmission of the virus and more experts are praising this progress.
Between his diagnosis and now, Alex spent six-and-a-half years in a relationship, and said the possibility - however tiny - of transmitting HIV to his partner was a source of anxiety. It also found zero risks.
As a result, the study underscores the importance of regular HIV testing and allotting resources to ensure that HIV-positive individuals are receiving regular ongoing treatment from a medical provider. "This has incredible impact on the lives of people living with HIV and is a powerful message to address HIV-related stigma".