Most common cause of HIV infection in infant is ?
First, I need to recall the core concept here. HIV transmission in infants is primarily through mother-to-child transmission during pregnancy, labor, or breastfeeding. This is a key point in pediatric infectious diseases. The mechanism involves the virus crossing the placenta or the infant being exposed during delivery or through breast milk.
Now, why is vertical transmission the correct answer? The majority of pediatric HIV cases are due to this route. Without intervention, the risk is around 15-30%, but with antiretroviral therapy and other measures, this can be reduced to less than 1%. The virus can pass through the placenta, especially if the mother's viral load is high, or during the birthing process when the baby is exposed to maternal blood and secretions. Breastfeeding can also be a route if the mother is not on treatment.
For the incorrect options, if they included other modes like blood transfusion, needle sharing, or sexual contact, those would be wrong. Blood transfusions are a rare cause now due to screening. Needle sharing isn't typical in infants unless in very specific circumstances. Sexual transmission is not a route for infants, as they can't engage in sexual activity. Also, other options like congenital infections from other viruses (like CMV) are not related to HIV specifically.
The clinical pearl here is that preventing mother-to-child transmission is crucial. Programs like PMTCT (Prevention of Mother-to-Child Transmission) have significantly reduced pediatric HIV cases. Antenatal screening and antiretroviral therapy for the mother and infant are essential.
Putting it all together, the correct answer is vertical transmission from the mother. I need to structure the explanation with the required sections, making sure each part is concise and covers the necessary points without exceeding the character limit.
**Core Concept**
Mother-to-child transmission (vertical transmission) is the primary route of HIV infection in infants. This occurs during pregnancy, labor, delivery, or breastfeeding due to exposure to maternal HIV-infected blood or secretions. Effective antiretroviral therapy (ART) can drastically reduce transmission risk.
**Why the Correct Answer is Right**
Vertical transmission accounts for >90% of pediatric HIV cases. The virus crosses the placenta (especially with high maternal viral load), is transmitted during birth via contact with maternal blood/secretions, or via breast milk postnatally. Without intervention, transmission risk is 15–30%; ART reduces this to 90% in high-income countries. All pregnant women should undergo HIV screening.
**Correct Answer: C. Vertical transmission from