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Volume 11, Number 11—November 2005

Dispatch

Respiratory Infections during SARS Outbreak, Hong Kong, 2003

Janice Y.C. Lo*, Thomas H.F. Tsang*, Yiu-Hong Leung*, Eugene Y.H. Yeung*, Thomson Wu*, and Wilina W.L. Lim*Comments to Author 
Author affiliations: *Department of Health, Hong Kong Special Administrative Region, People's Republic of China

Main Article

Table

Change in proportion of positive specimens (PPS) in 2003 for various viruses with reference to the period 1998–2002*

Virus Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Influenza
No. isolates 327 419 786 105 22 58 96 54 121 50 10 35
No. tests performed 1,166 1,530 5,432 3,758 1,495 974 776 665 1,283 1,193 1,008 1,407
PPS (03) 0.28 0.27 0.14 0.03 0.01 0.06 0.12 0.08 0.09 0.04 0.01 0.02
Average PPS (98–02) 0.235 0.368 0.329 0.154 0.127 0.143 0.186 0.153 0.063 0.022 0.019 0.044
Range of PPS (98–02) 0.067–0.321 0.143–0.519 0.121–0.517 0.065–0.203 0.043–0.194 0.072–0.216 0.145–0.232 0.123–0.173 0.040–0.105 0.009–0.044 0.008–0.030 0.022–0.110
% change†
+19
–26
–56
–82
–88
–58
–33
–47
+49
+87
–49
–44
Parainfluenza
No. isolates 29 35 75 12 2 1 11 26 29 68 75 112
No. tests performed 1,166 1,530 5,432 3,758 1,495 974 776 665 1,283 1,193 1,008 1,407
PPS (03) 0.02 0.02 0.01 0.00 0.00 0.00 0.01 0.04 0.02 0.06 0.07 0.08
Average PPS (98–02) 0.035 0.025 0.022 0.036 0.037 0.034 0.023 0.017 0.027 0.061 0.081 0.065
Range of PPS (98–02) 0.014–0.106 0.014–0.053 0.008–0.046 0.021–0.046 0.024–0.054 0.026–0.046 0.017–0.034 0.010–0.028 0.014–0.043 0.025–0.102 0.031–0.149 0.035–0.156
% change†
–28
–8
–38
–91
–96
–97
–38
+135
–16
–7
–9
+22
RSV
No. isolates 49 53 66 24 6 3 8 53 181 48 12 5
No. tests performed 1,166 1,530 5,432 3,758 1,495 974 776 665 1,283 1,193 1,008 1,407
PPS (03) 0.04 0.03 0.01 0.01 0.00 0.00 0.01 0.08 0.14 0.04 0.01 0.00
Average PPS (98–02) 0.014 0.021 0.055 0.104 0.081 0.066 0.072 0.094 0.092 0.036 0.022 0.032
Range of PPS (98–02) 0.003–0.054 0.010–0.065 0.037–0.090 0.055–0.155 0.049–0.112 0.042–0.098 0.038–0.113 0.046–0.126 0.057–0.118 0.018–0.051 0.001–0.060 0.001–0.072
% change†
+203
+64
–78
–94
–95
–95
–86
–15
+54
+13
–47
–89
Adenovirus
No. isolates 61 78 84 41 5 0 1 2 4 7 8 17
No. tests performed 1,166 1,530 5,432 3758 1,495 974 776 665 1,283 1,193 1,008 1,407
PPS (03) 0.05 0.05 0.02 0.01 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.01
Average PPS (98–02) 0.034 0.030 0.035 0.056 0.055 0.058 0.068 0.044 0.038 0.049 0.052 0.074
Range of PPS (98–02) 0.012–0.058 0.019–0.052 0.017–0.071 0.012–0.121 0.022–0.110 0.028–0.105 0.032–0.091 0.029–0.058 0.026–0.054 0.045–0.055 0.042–0.062 0.058–0.093
% change†
+52
+72
–55
–81
–94
–100
–98
–93
–92
–88
–85
–84
Hepatitis B
No. of positive test results 16 11 13 18 20 13 19 20 22 21 15 20
No. of tests performed 143 98 135 99 97 118 139 135 120 111 102 131
PPS (03) 0.112 0.112 0.096 0.182 0.206 0.110 0.137 0.148 0.183 0.189 0.147 0.153
Average PPS (98–02) 0.147 0.132 0.127 0.129 0.125 0.156 0.154 0.156 0.168 0.144 0.167 0.148
Range of PPS (98–02) 0.083–0.228 0.079–0.190 0.093–0.153 0.070–0.168 0.085–0.162 0.096–0.188 0.104–0.186 0.068–0.228 0.086–0.250 0.081–0.233 0.099–0.249 0.082–0.197
% change† –24 –15 –24 +41 +65 –29 –11 –5 +9 +32 –12 +3

*RSV, respiratory syncytial virus.
†Percentage change of PPS in 2003 with respect to the average PPS from 1998 to 2002.

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