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My daughter has larva migrans on her skin. Is there a risk for other family members? And how long does it take for Ivermectin to take effect?

There is very little risk of contagion to other family members with larva migrans cutaneous. The larvae are already embedded in the skin and cannot infect others. The medication should start to take effect within a few days, but it is important to ensure proper treatment to prevent itching and potential skin infections.