nitish.chowdry99
It is said Needles can transmit HIV because there is some blood struck inside. But theories also saying HIV dies instantly when came out from human host.
 So how come HIV spreads from Needles?

Say if Mosquite bit a HIV person, someone else kills the mosquite blood comes out , Doctors are saying this blood wont transmit HIV becoz it left the human host.

I am confused hot different are these 2?
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helpline-volunteer
Hi there,

Thank you for your inquiry. From what we gather from the question, you were asking about clarification on why used needles can transmit HIV while mosquitoes cannot.

First of all, it is worth mentioning that human immunodeficiency virus (HIV) is a specific kind of retrovirus that affects only humans, and therefore cannot be carried by mosquitoes.

Even if a mosquito feeds on a person living with HIV prior to coming in contact with you, the HIV would enter the insect's gut, which does not contain human T cells (1). Human T cells are necessary in order for the virus to replicate, so it is instead broken down by the mosquito's digestive system (1). Therefore mosquitoes cannot carry HIV from one individual to another and are considered No Risk for HIV transmission.

On the other hand, needles and other injection equipment like syringes may have blood from an HIV-positive individual in them, which can carry HIV (2). HIV can survive in a used syringe for up to 42 days, depending on temperature and other factors (2). Unlike mosquitoes, using shared needles posits a High Risk for HIV transmission.

Best wishes,
AIDS Vancouver Helpline/Online, Shirley

Additional Resources:
(1) If a used needle can transmit HIV, why can't a mosquito?
(2) Injection Drug Use and HIV Risk

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