a)i work in  construction sector, here people can get wounds (small or large) more frequently.suppose if a injured person's blood gets in another persons eye or wound , can he get hiv ?? 

b)as i said people get wounds more in construction field , a person can get exposed to other person's blood more frequently or multiple no. of times. what do you think??

Perhaps I don't understand the construction business, but I really don't envision much opportunity for direct contact with co-workers' blood. And there has never been a known case of HIV that was acquired by contact with someone's blood in the workplace or after the kinds of exposures that might occur in construction. One can imagine a theoretical scenario of transmission -- e.g. an injury with something sharp (a nail? a tool?) that had very recently (within a minute or so) injured another worker and still had wet blood, AND if the previously injured person happened to have HIV, AND if that person had a high viral load. But obviously the chance of these things is extremely low. As for your second question, multiple exposures obviously increases risk compared with one exposure. But still, with no known cases of HIV from such exposures, anywhere in the world, obviously the risk remains virtually zero regardless of frequency of such events.

Those comments address both your questions. You avoid HIV by having only safe sex and not sharing drug injection equipment with other persons. No matter where in the world you live, there are no other risks you need to worry about.

Let me know if anything isn't clear. Best wishes and stay sexually safe!  HHH, MD

As you said risk is low . 

1)Does amount of blood make difference in hiv risk??.i mean small and large amount of blood.

2) As you said hiv risk is low and there are no known cases , if a person gets exposed to other person blood ( small or large) one time or multiple times, would you recommend hiv testing??

3) when you say hiv risk is not known or hiv risk is low. It means even if a person gets exposed to other person's  blood ( large or small amount ) one time or multiple times , chances of getting hiv is rare or low. Is that right??

2,3) This is the same question, asked twice -- and it was already answered above. I do not recommend testing even if you think such unnoticed exposures have occurred many times.

2) It really isnt confusing at all. HIV transmission requires much more blood exposure than you have described at construction sites. And for infection to take hold, the blood must have access to certain cells deep in the body.

That completes the two follow-up questions and replies included in each thread on this forum, and so ends this discussion. Please note the forum does not permit repeated questions on the same topic or exposure. This will have to be your last one; future new questions along these lines and your fears about HIV through construction work will be deleted without reply and without refund of the posting fee. This policy is based on compassion, not criticism, and is designed to reduce temptations to keep paying for questions with obvious answers. In addition, experience shows that continued answers tend to prolong users' anxieties rather than reducing them. Finally, such questions have little educational value for other users, one of the forum's main purposes. I trust you will understand.