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.
Penicillin works great for strep throat. If the question 'how long does strep throat last without antibiotics' is haunting you, here is the answer. The symptoms of throat infection begin to subside in four or five days. But if it is left untreated, then there is a possibility of getting rheumatic fever about 20 days after strep throat.