Throat infection causes Ear infection through:
M/C route of infection in middle ear is Eustachian tube. Infection travels the lumen of the tube or along subepithelial peritubal lymphatics.Eustachian tube is infants and young children is shoer, wider and more horizontal and thus accounts for higher incidence of infections in this age group.
Blood spread
Eustachian tube
Nasocranial spread
Simultaneous infection