Appendix 2.

Questionnaire Section to Determine Pre-Existing Conditions/Risk Factors.

Item	Response
Contact with a positive case at work	1-Yes
	2-No
Contact with a positive case at home	1-Yes
	2-No
Obesity	1-Yes
	2-No
Diabetes	1-Yes
	2-No
Asthma	1-Yes
	2-No
Chronic lung disease	1-Yes
	2-No
HIV/immunodeficiency	1-Yes
	2-No
Pregnancy	1-Yes
	2-No
Smoking	1-Yes
	2-No
Cancer	1-Yes 2-No
Heart disease	1-Yes
	2-No
Chronic kidney disease	1-Yes
	2-No
Chronic liver disease	1-Yes
	2-No
Chronic hematological disorders	1-Yes
	2-No
Chronic neurological impairment/disease	1-Yes
	2-No
Organ or bone marrow recipient	1-Yes
	2-No
Other, please specify

Abbreviation: HIV, human immunodeficiency virus.