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Volume 14, Number 3—March 2008

Research

Increased Mortality Rate Associated with Chikungunya Epidemic, Ahmedabad, India

Dileep Mavalankar*Comments to Author , Priya Shastri*, Tathagata Bandyopadhyay*, Jeram Parmar*, and Karaikurichi V. Ramani*
Author affiliations: *Indian Institute of Management, Ahmedabad, India;

Main Article

Table

Monthly chikungunya cases, deaths, and mortality rates, Ahmedabad, India, 2002–2005 and 2006*

Month Chikungunya cases, 2006 Mortality rate/10,000 (99% CI), 2002–2005 Expected deaths, 2006 (99% CI) Actual deaths, 2006 Excess deaths, 2006 Mortality rate/10,000, 2006 % Change in mortality rate
Jan ND 6.19 (6.00–6.41) 2,422 (2,342–2502) 2,559 137 6.54 +5.66
Feb ND 5.56 (5.37–5.76) 2,180 (2,105–2255) 2,227 47 5.68 +2.14
Mar ND 5.76 (5.56–5.95) 2,264 (2,187–2,341) 2,337 73 5.95 +3.24
Apr 434 5.75 (5.53–5.92) 2,260 (2,183–2,337) 2,150 −110 5.47 −4.89
May 141 6.16 (5.93–6.33) 2,428 (2,349–2,507) 2,510 82 6.37 +3.37
Jun 31 5.80 (5.56–5.95) 2,290 (2,213–2,367) 2,156 −134 5.46 −5.86
Jul 184 5.50 (5.27–5.65) 2,177 (2,102–2,252) 2,270 93 5.73 +4.27
Aug 28,233 6.08 (5.82–6.21) 2,410 (2,331–2,489) 2,942 532 7.42 +22.09
Sep 27,360 6.40 (6.12–6.52) 2,541 (2,460–2,622) 3,989 1,448 10.05 +56.96
Oct 3,555 5.92 (5.64–6.03) 2,355 (2,277–2,433) 3,121 766 7.85 +32.51
Nov 539 6.27 (5.97–6.38) 2,500 (2,420–2,580) 2,698 198 6.77 +7.90
Dec
300
6.54 (6.22–6.63)
2,613 (2,531–2,695)
2,537
−76
6.35
−2.90
Total 60,777 28,440 (27,500–29,380) 31,496 3,056

*CI, confidence interval; ND, no data available.

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