[Genotype D4] 4 cases; 3 cases in February and one case in March.
   In Tokyo, one case developed measles 12 days after visiting Viet Nam (3 days before
   returning home) and one domestic sporadic case in February.
   In Chiba, one domestic sporadic case in February.
   In Toyama, one case in March developed measles after returning from Pakistan.
[Genotype D8] 27 cases; 14 cases in January and 13 cases in February.
   In Chiba, 3 cases in January; one domestic case who developed measles after contact with
   a family member who developed measles in December 2011 and 2 domestic sporadic cases.
   In Tokyo, one case in January developed measles 3 days before returning from Thailand.
   In Aichi, 15 domestic sporadic cases; 5 cases in January and 10 cases in February.
   In Gifu, 3 cases in January; one domestic sporadic case and 2 family members.
   In Yamanashi, one domestic sporadic case in February.
   In Chiba, 3 cases in February; one domestic sporadic case and a family member in February
   and another domestic sporadic case. 
[Genotype D9] 8 cases; 2 cases in January, 5 cases in February and one case in March.
   In Okayama, 2 family members developed measles 10 and 18 days after returning from
   Philippines in January and 3 secondary/tertiary contact cases in February.
   In Tokyo, one domestic sporadic case in February.
   In Chiba, one domestic sporadic case in February.
   In Tochigi, one domestic case of a familial outbreak in March.
[Genotype A (vaccine type)] 5 cases; one case in February and 4 case in March.
   In Ibaraki, a measles-suspected case in February [from the specimen taken 16 days after
   MR vaccination. Rubella virus genogroup 1a (vaccine type) was simultaneously detected].
   In Chiba, a measles-suspected case in March [from the specimen taken 13 days after
   MR vaccination.
   In Yamanashi, a measles-suspected case in March [from the specimen taken 20 days after
   MR vaccination.
   In Mie, 2 measles-suspected cases in March [both from the specimen taken 12 days after
   MR vaccination.