Pray, how do these healers make virus disappear?

In Kenya many people die every year because they get HIV or Aids, even if they have the money for the medicine. They believe they will be healed by preying and that God will help them. So they go to witchdoctors, healers and priests so they can get prayed for, as a result they get better…. The problem is that they do not get healed. They are just told that they are, and get fake medical test back, so they stop taking the meds and later on they die.
Faith healers, quacks and witchdoctors take advantage of victims’ helplessness.
Many of the bishops in charismatic churches broadcast themselves in local media. They show ill people get healed by praying, but it’s all fake. The ill people in the commercial, never was ill and they make a false picture of the reality. So they end up with spending money on there own death.
It is an example in the text. It says: When Agnes* was diagnosed with HIV, she was devastated.
She joined a charismatic church near her home in Nyeri and swiftly became ‘born-again’, accepting Jesus as her personal saviour.
Her friends were surprised at the sudden change, considering her former lifestyle.
Her health was fast deteriorating, but a fellow worshiper promised to take her to a bishop based in Nairobi, to pray for her.
On the advice of her church, she also refused to take ARVs. But several prayer sessions failed to heal her.
"She refused to be taken to hospital, believing God would heal her," a friend said at her funeral.