<s>[INST] When do middle ear infections typically occur? [/INST] Usually a week or two after the child has an upper respiratory tract infection. This can cause inflammation and fluid to build up behind the ear drum. This fluid can become infected with bacteria and your child will likely develop ear pain, fever, and irritability and may be tugging at his or her ears. Source: UIHC.ORG. Link: https://uihc.org/childrens/health-topics/ear-infections-children-frequently-asked-questions. Field: Otolaryngology. Disease: Ear Infection </s>