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TABLE A13-1 Underlying Conditions Present by Age Group

Underlying Condition

<15 years n = 62

15-44 years n = 85

>45 n = 88

Drug addiction

0

8

16

Cardiovascular

6

5

19

Diabetes

0

6

19

Pregnancy

0

12

0

Hematologic

8

9

9

Hepatic

1

4

2

Arterial hypertension

2

7

45

Congenital malformation

10

0

0

Neurological

12

2

5

Obesity

3

21

31

Oncology and immunodeficiencies

16

17

24

Neonatal pathology

22

0

0

Kidney

5

6

18

Respiratory

8

8

35

Genetic syndromes

12

2

1

HIV

0

8

1

SOURCE: Ministry of Health National Surveillance System.

had access to a telephone), giving 81 cases for the survey. We collected information from 270 of these contacts and found that 32 had symptoms, giving a high rate of 14 percent (32 of 232). We also found that in these households there were 37 clinical cases taken prior to the survey and the prevalence of disease in these households was confirmed at 43 percent (150 of 351). This sampling was conducted when chemoprophylaxis was given partially; the effectiveness of it was determined. Symptoms were found in 17 out of 71 persons with no chemoprophylaxis and in 8 out of 93 that had received chemoprophylaxis. Therefore, the risk of illness is higher in those who did not have chemoprophylaxis (RR = 2.78, 95 percent CI 1.2-6.8; p = 0.006). During the epidemic there were jurisdictions for which the supply of drugs was low for the period when chemoprophylaxis and treatment were performed for severe cases or for all ILI treatment, as in the Health Region II of the Province Buenos Aires. Also, in other jurisdictions, like the Province of Tierra del Fuego, there was not a mitigation step introducing a transition phase in which treatment of all cases continued, but chemoprophylaxis was not given. This strategy showed a considerable difference in the rate of hospitalization and in mortality, as seen in the pyramids of each region (Figures A13-18 and A13-19).



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