Volume 18, Number 2—February 2012
Dispatch
Invasive Pneumococcal Pneumonia and Respiratory Virus Co-infections
Table 2
Negative binomial regression analysis of the association of invasive pneumococcal pneumonia weekly incidence with influenza and respiratory syncytial virus activities *
Season | p value† | % Influenza A (H1N1) | % Influenza A (H3N2) | % Influenza B |
---|---|---|---|---|
1994–95 | 0.029 | 1.05 | 58.98‡ | 39.96 |
1995–96 | 0.2 | 36.58 | 30.39 | 33.03 |
1996–97 | 0.002 | 0.58 | 50.29‡ | 49.12 |
1997–98 | 0.09 | 0.19 | 98.66‡ | 1.15 |
1998–99 | 0.015 | 1.04 | 58.40‡ | 40.55 |
1999–00 | 0.424 | 3.8 | 95.75‡ | 0.45 |
2000–01 | 0.069 | 46.88 | 1.04 | 52.08‡ |
2001–02 | 0.641 | 12.09 | 74.53‡ | 13.38 |
2002–03 | 0.649 | 30.22 | 4.64 | 65.14‡ |
2003–04 | 0.004 | 0.03 | 98.75‡ | 1.22 |
2004–05 | <0.001 | 0.19 | 69.97‡ | 29.85 |
*Analysis adjusted by temperature, sunshine, and precipitation. p values based on the likelihood ratio test for lack of association.
†Boldface indicates a statistically significant association.
‡Predominant (>50%) influenza strain.
1Current affiliation: Columbus Technologies and Services, Inc., Atlanta, Georgia, USA.