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Table 1 The seroprevalence of syphilis in Chengdu blood center, 2005–2017

From: Seroprevalence and risk factors on Syphilis among blood donors in Chengdu, China,from 2005 to 2017

 

2005

2006

2007

2008

2009

2010

2011

2012

2013

2014

2015

2016

2017

Total number of blood donations

92610

105949

121745

137524

150702

145691

149863

153299

160507

182222

192959

205963

219140

Number of initial blood donors

82304

86948

93272

104551

110174

102357

120561

134350

128455

116679

117722

122212

124779

Number of repeat donors

10306

19001

28473

32973

40528

43334

29302

18949

32052

65543

75237

83751

94361

Total number of syphilis-positive

815

804

889

1019

1302

1486

1452

1825

2280

1869

1709

2052

2157

syphilis-positive in the initial blood donors.

734

712

796

938

1119

1245

1241

1541

1869

1621

1516

1795

1828

syphilis-positive in repeat donors

81

92

93

81

183

241

211

284

411

248

193

257

329

Rate of TP-Positive(%)

0.88

0.76

0.73

0.74

0.86

1.02

0.97

1.19

1.42

1.02

0.89

1.00

0.98

Seroprevalence(%)

0.89

0.82

0.85

0.90

1.02

1.22

1.03

1.15

1.46

1.39

1.29

1.47

1.46

serological incidence (%)

0.79

0.48

0.33

0.25

0.45

0.56

0.72

1.50

1.28

0.38

0.26

0.31

0.35

P value

0.282

<0.001

<0.001

<0.001

<0.001

<0.001

<0.001

<0.001

0.021

<0.001

<0.001

<0.001

<0.001

  1. Seroprevalence(%): the seroprevalence was calculated using the total number of syphilis-positive donors as the numerator in the initial blood donation, the total number of initial blood donors at the same period as the denominator. Serological incidence(%): The total number of syphilis-positive in the repeat blood donors in that year was the numerator, all repeat blood donors during the same period was the denominator