Haint yw llid yr ymennydd o’r pilennau (membranes) o amgylch yr ymennydd a llinyn y cefn, ac mae’n gallu bod yn gyflwr difrifol iawn os na chaiff ei drin yn gyflym.
Fe allai effeithio ar unrhyw un ond mae’n fwyaf cyffredin o blith babanod, plant ifanc, pobl ifanc yn eu harddegau ac oedolion ifanc.
Mae profion yn gallu cadarnhau achos yr haint, boed yn sgil bacteria penodol neu ambell feirws.
Mae llid yr ymennydd bacterol yn fwy prin na llid yr ymennydd feirol ond mae’n fwy difrifol. Fe allai arwain at wenwyno’r gwaed, neu sepsis, ac effeithio ar yr ymennydd.
Llid yr ymennydd ymledol yw’r math yma o haint difrifol, gan fod yr haint wedi cyrraedd y llif gwaed neu leininau’r ymennydd.
Meningitis B, neu MenB, yw’r straen wrth wraidd mwyafrif yr achosion o salwch meningococaidd yn y DU, gan gynnwys y marwolaethau mwyaf diweddar yng Nghaint.
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