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14th ICID - Poster Abstracts - International Society for Infectious ...

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When citing these abstracts please use the following reference:<br />

Author(s) of abstract. Title of abstract [abstract]. Int J Infect Dis 2010;14S1: Abstract number.<br />

Please note that the official publication of the <strong>International</strong> Journal of <strong>Infectious</strong> Diseases 2010, Volume 14, Supplement 1<br />

is available electronically on http://www.sciencedirect.com<br />

Final Abstract Number: 28.028<br />

Session: Influenza<br />

Date: Wednesday, March 10, 2010<br />

Time: 12:30-13:30<br />

Room: <strong>Poster</strong> & Exhibition Area/Ground Level<br />

Type: <strong>Poster</strong> Presentation<br />

Factors associated to death in patients with confirmed diagnosis <strong>for</strong> influenza A/H1N1. State of<br />

Sao Paulo, Brazil, April to October, 2009<br />

A. Ribeiro, A. C. G. Pellini, T. R. M. P. Carvalhanas, B. D. L. Liphaus, A. L. F. L. F. Yu, G. D.<br />

Freitas, M. D. C. S. T. Timenetsky<br />

State Secretary of Health of Sao Paulo, Sao Paulo, SP, Brazil<br />

Background: In April, 2009, a new subtype of influenza A/H1N1 virus emerged from the<br />

American continent, spreading worldwide. Until the end of October, 2009, WHO reported more<br />

than 440.000 influenza A/H1N1 laboratory-confirmed cases, registering more than 5.700 deaths.<br />

Studies point out that population groups who develop higher severity and mortality are: children<br />

less than two years of age, young adults, patients with chronic diseases and pregnant women.<br />

Methods: An exploratory analysis was per<strong>for</strong>med to identify factors associated with death among<br />

confirmed cases of influenza A/H1N1, considering the residents and other people treated in<br />

healthcare facilities in SP, from EW 16 to 41. Data were collected from the In<strong>for</strong>mation System of<br />

Notifiable Hazards – Influenza Online. Association between remarkable expositions and death<br />

caused by influenza A/H1N1 was investigated by unadjusted odds ratio estimation, with 95%<br />

confidence intervals, employing the EpiInfo software.<br />

Results: In SP, since EW 16, 31.589 influenza A/H1N1 suspected cases were reported, from<br />

which 5.242 (16,6%) were confirmed and fulfilled the criteria <strong>for</strong> Severe Acute Respiratory<br />

Disease. Among these, 372 cases resulted in death, 3.619 were discharged from hospital and<br />

1.251 are still under investigation. The following variables showed association with death caused<br />

by influenza A/H1N1: chronic cardiopathy OR=3,00 (IC95%=2,05-4,40); chronic renal failure<br />

OR=3,85 (IC95%=2,02-7,33); immunosuppression OR=4,93 (IC95%=3,35–7,25); tobacco abuse<br />

OR=1,52 (IC95%=1,03-2,26); chronic metabolic disease OR=6,36 (IC95%=4,27–9,48); diarrhea<br />

OR=1,56 (IC95%=1,16-2,10); ); residence in the metropolitan area of Greater Sao Paulo in<br />

relation to the interior of state OR=1,37 (IC95%=1,11-1,70). Variables which did not present<br />

association with death were: lack of previous vaccination against influenza OR=1,65<br />

(IC95%=0,93-2,93) or pneumococcus OR=1,22 (IC95%=0,44-3,39); chronic pneumopathy<br />

OR=1,14 (IC95%=0,80-1,61); haemoglobinopathy OR=1,74 (IC95%=0,60-5,04).<br />

Conclusion: Widespread knowledge of influenza A/H1N1 epidemiology, its complications and<br />

risk factors <strong>for</strong> death is extremely important to support the implementation of strategies to prevent<br />

and control this disease in high-risk groups. Comparison of data found in the assessed population<br />

with other similar studies is recommended.

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