Merck Manual

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Conjunctival and periorbital swelling, AHS
conjunctival-and-periorbital-swelling-ahs-weyer-web
Conjunctival and periorbital swelling, AHS

    Photograph of a horse with confirmed AHS, showing swelling of the conjunctivae and periorbital swelling seen in the cardiac (dikkop) or mixed forms of AHS.

Courtesy of Dr. Camilla Weyer.