A new adenovirus of intermediate type involved in conjunctivitis has been isolated. The virus is related to adenovirus types 13 and 30 by neutralization and to types 10 and 19 by hemagglutination inhibition. Since 1976 the agent has been causing sporadic cases of conjunctivitis in different parts of The Netherlands. Twenty-three cases have been established by virus isolation from the affected eyes. The symptoms of the disease range from epidemic keratoconjunctivitis to pharyngoconjunctival fever. Also, adenovirus type 13-30/10-19 has been isolated from the cervix uteri of four women in a series of 1,477 women with cervicitis.