" Along with a host of other illnesses, strep throat is most prevalent during winter. Strep throat is a bacterial infection caused by the Streptococcus bacteria. While most strep cases are found in children, adults can develop strep throat as well. The infection is highly contagious as it spreads person-to-person via saliva. If a person with strep throat coughs near a doorknob, anyone who touches that doorknob could be susceptible to contracting strep throat. Strep throat ...