TABLE 1

Demographic characteristics and clinical history of the study population

ParameterNo. of patients (%)
Overall (n = 1,691)Febrile (n = 566)Afebrile (n = 1,125)
Gender
    Female970 (57)276 (49)694 (62)
    Male721 (43)290 (51)431 (38)
Age (yr)
    2–5416 (25)202 (36)214 (19)
    6–11390 (23)175 (31)215 (19)
    12–17195 (12)81 (14)114 (10)
    18–2061 (4)20 (4)41 (4)
    21–39427 (25)71 (13)356 (32)
    40–54153 (9)13 (2)140 (12)
    55+49 (3)4 (1)45 (4)
Symptoms
    Chills1,135 (67)442 (78)693 (62)
    Body pain1,159 (69)387 (68)772 (69)
    Headache1,364 (81)473 (84)891 (69)
    Vomiting257 (15)129 (23)128 (11)
    Stomach ache185 (11)128 (23)57 (5)
    Weakness68 (4)56 (10)12 (1)
    Anorexia186 (11)86 (15)100 (9)
    Cough189 (11)117 (21)72 (6)
    Catarrh170 (10)107 (19)63 (6)
    Bitter taste31 (2)25 (4)6 (1)
    Dizziness46 (3)35 (6)11 (1)
    Other83 (5)25 (4)58 (5)
Study site
    Agura365 (22)75 (13)290 (26)
    Bayekun218 (13)88 (16)130 (12)
    Ijede522 (31)206 (36)316 (28)
    Imota439 (26)164 (29)275 (24)
    Oreta48 (3)6 (1)42 (4)
    Shomolu99 (6)27 (5)72 (6)
  • a The mean age ± SD for each group was as follows: overall, 18.6 ± 15.9 years (range, 2.0 to 80 years); febrile, 11.6 ± 11.0 years (range, 2.0 to 70 years); afebrile, 22.1 ± 16.7 years (range, 2.0 to 80 years).