Symptoms | Probable source of infection | |
Hay#,+ | Hare/mosquito bite¶,§ | |
Fever | 88 | 94–96 |
Chills | 69 | 70–83 |
Headache | 59 | 30–76 |
Malaise | 46 | 22–53 |
Sore throat | 28 | 0–22 |
Conjunctivitis | 26 | 9–17 |
Lymphadenitis | 10 | 83–87 |
#: based on 140 patients in an outbreak in 1966 32
¶: based on two outbreaks, comprising 23 cases in 1966 32 and 344 in 1981 44
+: percentage of cases presenting with symptoms
§: range of percentages