Following some medical information i did read that hiv virus on dry blood can stay infectious for 6 days and some says for 42 days it will be infectious and active even in dry blood.

My main inquiry and worry is specially about the being active for 42 days 

Q1-  can hiv virus on dry blood be infectious and active after 42 days  specially  ?

Q-2 Or 42 days is enough and that is the maximum that the virus can stay active and alive on the dry blood mark

 

I'm happy to address this very common concern as revealed by many forum questions. It's in the category of some questions that can be answered accurately based only on the title the user chooses, before reading the question itself. Before I go any further, I'll say that contact with blood (or other HIV infected body fluids) in the environment is 100% risk free. There has never been an HIV transmission reliably documented to have been acquired in this manner. Duration of HIV survival isn't the issue or even the right question:  no matter how long the virus might survive, with no apparent transmissions, the risk of contact is obviously zero and the biological reasons for that absent risk don't matter. That's why there's actually been very little research on this point.

Now I have read the rest of your questions. The answers are pretty clear from my opening comments. 

Q1. Almost certainly the virus would be long dead -- but even if somehow virus was surviving, contact with dry blood carries no risk of HIV.

Q2. Again, how long HIV might survive isn't known with certainty. As already implied, I am unaware of credible research showing survival as long as 6 weeks (42 days) or even 6 days; most work suggests the virus is dead once the blood has dried, i.e. a few minutes to maybe a few hours, depending on the amount and local conditions like temperature and humidity.

You don't describe what sort of contact you may have had with blood in your environment. I'd be happy to comment further if there is a particular event that concerns you. However, you can probably predict my response from the comments above.

I hope you find these comments helpful and reassuring. Let me know if anything isn't clear.

HHH, MD

For the sort of contact i faced, i had an installation worker in my house , he had a cut on his hand and was bleeding .. and he was touching some surfaces in the room , so i avoided touching what he did touch and now it’s been more than 42 days since the incident.

Q1- Doctor I understand that hiv transfer through mouth, penis , and rectum. So what about touching an hiv infected dry blood then i eat directly with my hand or I touched my mouth or penis without washing my hand ?

Q-2 you are saying dry blood carries no risk oh Hiv , is it because the blood is dry ? Like it can’t have an effect when it’s dry ?

Q1. This would be zero risk. Swallowing HIV (even wet blood) usually does not result in infection.

Q2. As I said above, we don't know exactly why there is no risk in this situation. Probably the virus is dead and unable to establish infection after blood dries. But even if the virus were to survive, the evidence is that nobody every gets infected from such contact. When there is no risk, there also is no point in worrying about the biological reasons.

Even if i did touch that same surfaces now that he was touching with his bloody hand it’s risk free from hiv ?

So since dry blood is no risk to transmit Hiv. I should not worry about being in contact with  dry blood Even if i practice normal life ? Like eating and touching my mouth face without washing my hand with soap ?

Q1 and Q2. Both these statements are true. You correctly understand my replies.

That makes two follow-up clarifications and replies, which concludes this thread. I hope the discussion has been useful. Just know this:  you will never catch HIV if you do not have vaginal or anal sex or share drug injection equipment with another person. All other potential contacts with other people are free of risk for HIV, even if the other person is infected.

I hope the discussion helps you move on without worry. Best wishes and stay safe.