The pathogenic p o t e n t i a l of human r o t a v i r u s e s of s e r o t y p e s 1 through 4 was e v a l u a t e d i n s u c k l i n g mice. Oral i n o c u l a t i o n of t h r e e d i f f e r e n t human r o t a v i r u s e s of s e r o t y p e 3 i n t o 5-6 day o l d CD-1 mice caused d i s e a s e c h a r a c t e r i z e d by d i a r r h e a and dehydration. The mean 50% d i a r r h e a inducing dose (DD50) was

We report an unusual case occurring in a 25-year-old male of a balloon cell nevus which also showed clinical and pathological features of a halo nevus.