Scab

Scab may refer to:

Biology

 * Scab, a hard coating on the skin formed during the wound healing reconstruction phase
 * scAb, single-chain antibody fragment

Infections and infestations

 * Apple scab, an apple tree (genus Malus) fungal disease caused by Venturia inaequalis
 * Black scab, a potato fungal disease caused by Synchytrium endobioticum
 * Common scab, a plant bacterial disease caused by Streptomyces species
 * Fusarium head blight, a fungal disease of plants, e.g., grain crops (especially wheat and oats), golf course grass, caused by the several species of Fusarium
 * Pear scab, a pear fungal disease caused by Venturia pirina or Fusicladium pyrorum
 * Poinsettia scab, a spot anthracnose disease caused by Sphaceloma poinsettiae
 * Powdery scab, a disease of the skin of potatoes caused by the protozoa Spongospora subterranea
 * Sheep scab, a skin disease of sheep caused by the mite Psoroptes ovis

Labor

 * Scab, a pejorative term for a strikebreaker, a person who works despite strike action or against the will of other employees

Other uses

 * South Coast Air Basin, in California, US
 * Johnny Dole & The Scabs, one of the first punk rock bands in Australia