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HIV infection by sharing toothbrushes

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Hi doctor
A one month ago my brother used my teeth toothbrush then after 25 hours he used my teeth toothbrush ,I have reused that toothbrush. But I had washed that toothbrush by hand soap before used that toothbrush .so my questions
1, is have I probability to infect by hiv viruses if my brother is hiv positive?
2, I had washed that toothbrush by hand soap before I have used that toothbrush .so is that hand soap can remove hiv virus if he was bleeding when he used my toothbrush?
3, Can toothpaste that I have used kill hiv blood on a toothbrush?
I hope someone can help me!

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replied July 19th, 2010
HIV and AIDS Answer A14318
Hi and welcome to the forum! I am glad that I can help you.

You want to know whether you might be at risk of being infected with HIV.

HIV (human immune deficiency virus) affects the T-helper cells causing weakening of the immune system. It is transmitted with direct contact of blood flow with bodily fluids such as blood, semen, pre-ejaculate, vaginal fluid and breast milk. If a toothbrush contains invisible traces of blood the virus can be passed by further usage. Hand soap usually removes the bacteria and the dirt mechanically. The toothpaste removes the remainings of the food on teeth and so mechanically removes the oral bacteria. Although certain viruses are killed with low or high temperatures or by application of soap, there is yet no information about whether it can survive outside a human's body unless there are blood particles or particles from the liquids that contain it.

According to the data that you described, you may or may not be at risk of being infected with HIV. The human body needs 2-12 weeks to develop antibodies against this virus. Since it has been 4 weeks from the suspicious event you may consider having a diagnostic test in a few days and after twelve weeks. You may also consider not sharing toothbrushes or razors with other individuals.

Please keep in mind that I provide medical information only. I am not able to diagnose medical conditions online. Please contact your doctor for further advice and information about diagnosis of HIV.

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