Volume 17, Number 8—August 2011
Letter
Saffold Virus Infection in Children, Malaysia, 2009
Table
Prevalence of SAFV-specific IgG in serum from children 10–12 years of age, by sex, Malaysia, 2009*
State of residence | No. children | No. positive serum samples† |
|||
---|---|---|---|---|---|
+ | ++ | +++ | Total no. (%) | ||
Penang | |||||
M | 40 | 21 | 7 | 0 | 28 (70.0) |
F | 40 | 19 | 5 | 2 | 26 (65.0) |
Total |
80 |
40 |
12 |
2 |
54 (67.5) |
Kelantan | |||||
M | 40 | 16 | 8 | 5 | 29 (72.5) |
F | 40 | 18 | 11 | 2 | 31 (77.5) |
Total |
80 |
34 |
19 |
7 |
60 (75.0) |
Selangor | |||||
M | 40 | 16 | 11 | 5 | 32 (80.0) |
F | 40 | 22 | 5 | 0 | 27 (67.5) |
Total |
80 |
38 |
16 |
5 |
59 (73.8) |
Sabah | |||||
M | 40 | 16 | 9 | 4 | 29 (72.5) |
F | 40 | 24 | 6 | 1 | 31 (77.5) |
Total |
80 |
40 |
15 |
5 |
60 (75.0) |
Sarawak | |||||
M | 40 | 22 | 6 | 3 | 31 (77.5) |
F | 40 | 19 | 5 | 4 | 28 (70.0) |
Total | 80 | 41 | 11 | 7 | 59 (73.8) |
*SAFV, Saffold virus; Ig, immunoglobulin
†The degree of positive reactivity was classified into 3 groups: weak (titer <0–40), medium (titer 80–160), and strong (titer 320–1,280) according to the staining intensity on SAFV-infected Vero cells (data not shown). The classification was further confirmed by correlation with virus neutralizing titer from 20 samples in each group, with + samples having a titer of 0–40, ++ samples 80–160, and +++ samples 320–1,280, respectively.