An infant who has been exposed to antibodies through pregnancy or mothers milk and still has them will react exactly the same as somebody who had dengue before. Maternal antibodies usually last up to 6 months or more.
You can do an IGG test for infant, to determine. If your baby has antibodies or not.
If a baby tests positive for IGM, they had their own direct infection.
Not all babies get IGG from breast milk.
If they test negative for IGG, they will respond to a subsequent dengue infection as an initial infection, not as a more dangerous second infection.
Retest the baby six months after breastfeeding stops to see If he has own immunity, usually mom's antibodies only last 3-6 months.
Classic dengue is generally milder in young people. But the risk of DHF increases in infants (less than 1 year) due to the presence of maternal antibodies. Risk of fatality from DHF with adequate treatment is similar across different age groups.
More children contract dengue, because they have not been exposed to the virus previously and are susceptible.
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