After the isolation of West Nile virus (WNV) from humans, mosquitoes, and chickens in 2007, an analysis of animal surveillance involving multiple species (horses, monkeys, sheep, dogs, and birds) used to track WNV transmission from 2006 to 2008 was performed. During this period 13.4% of all the animal samples collected were seropositive by blocking ELISA for WNV. The most complete island-wide sampling was obtained from horses of which 22% were serologically positive and 96% were confirmed as WNV infections by plaque-reduction neutralization test. Our conclusion from this 3-year study is that animal surveillance is an early indicator of WNV activity before the identification of human cases. Additionally, the results indicated that horses have a greater geographical range and should be continued to be used as sentinels for passive surveillance in the tropics.
Motor vehicle accident fatalities (MVAF) are an important cause of death that affects millions of people worldwide. Using the Puerto Rico Institute of Forensic Science database, this study accessed the mortality trends of MVAF in Puerto Rico from 2000 to 2007. Descriptive statistics, age-adjusted mortality rates, geographical analysis, and annual percentage change were calculated. An annual mean of 559 MVAF occurred during the study period. The overall MVAF mortality rate declined from 2000 to 2007 (16.6 and 12.4 per 100,000 population, respectively)-mortality rates annually decreased 3%. Most MVAF (80.2%) occurred in men, showing a risk four times higher than women (23.6 and 5.4 deaths per 100,000 populations, respectively). Drivers aged 20-24 years and pedestrians older than 75 years had the highest risk of death. This study emphasizes the need of public health efforts to focus on the prevention of MVAF in the most affected groups.
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