From: Post-infectious headache: a reactive headache?
Parameters
Headache preceded by infection (n = 23)
Type of illness
Specific illness
Dengue
2
H1N1
Salmonella typhi
1
Non specific
Rhinitis
8
Pharyngitis
7
Gastroenteritis
3
Time interval with headache onset (weeks)
<1
1–2
2–3
6
3–4