Though most MRSA infections aren’t serious, some can be life-threatening. Many public health experts are alarmed by the spread of tough strains of MRSA. Because it’s hard to treat, MRSA is sometimes called a “super bug.” All health care-associated and community-associated strains of MRSA still respond to certain antibiotics. In some cases, antibiotics may not be necessary. For example, we may drain a superficial abscess caused by MRSA rather than treat the infection with drugs.