This builds your own shield against the diseases of the past. Practice personal hygiene. Hand washing is an essential part of home and community hygiene. Until very recently, tuberculosis was a great killer of humanity - and it was spread mainly by these bad health habits. Practice sexual responsibility.
Abstinence spreads no diseases.
Practice safe food preparation and storage - keep it hot or keep it cold. Keep it clean. Keep tight-fitting lids on trash to deny food to rats and flies. Don't let water stand in tires, ditches, buckets, etc. These are breeding sites for mosquitoes.