Table 1. Inclusionary and exclusionary criteria for selection of Controls –I and II during pandemic study.

Inclusionary criteria

1) 20-55 years old; living in Mexico City metropolitan area

2) Relative (not by blood)

3) Admitted and treated for different reasons (pneumonia: Controls- I)

4) Admitted and treated for different reasons (ILI symptoms; Controls- II)

5) Negative Real Time-Polymerase Chain Reaction assay on pandemic (AH1N1) strain

6) Range of Hemoglobin: 12.0 g/100 mL-16.0 g/100 mL

7) Range of Hematocrit: 38–48%

8) Body weight: indistinct; overweight (BMI > 25) preferred

Exclusionary criteria

1) Pregnancy or breastfeeding

2) H1N1 or seasonal influenza or pneumococcal vaccinations receiveda

3) VIH or auto-immune diseases

4) Hepatitis (any kind)

5) Allergies (any kind)

6) Medical treatment (any kind)

7) Use of toxicology substances (any kind)

^aOne control –I received pneumococcal vaccine before sample was taken.