cytomegalovirus
Concise Oxford English Dictionary © 2008 Oxford University Press:
cytomegalovirus /ˌsʌɪtə(ʊ)ˈmɛg(ə)lə(ʊ)ˌvʌɪrəs/
▶noun Medicine a kind of herpesvirus which usually produces very mild symptoms in an infected person but may cause severe neurological damage in people with weakened immune systems and in the newborn.
'cytomegalovirus' also found in these Oxford entries:

