Zinc oxide is a powdered mineral that sits on top of the skin, scattering, reflecting, and absorbing UVA & UVB rays. Although zinc oxide is the safest and most effective active sunscreen ingredient, the best protection from the sun is to seek shade and cover up with clothes and a hat.
Story at-a-glance 1  -. With immediate and antibiotic-free treatment, strep throat can improve in two to five days, up to a week. 2  Immediate treatment of strep throat is very crucial not just for quick recovery, but because an untreated case of strep throat can lead to further complications.
Incubation Period: The strep throat incubation period can vary from person to person. Usually the incubation period lasts between one to five days, meaning that a person who was exposed to the strep bacteria can manifest symptoms after one, two, three, four or five days. Most people develop the illness three days after contact.