Table 7 Relative risk of infection for contacts as compared with household contacts
Contact | Relative risk of infection |
|---|---|
Close | |
 Household | 1.0 |
 Kindergarten | |
  Same grade | 0.7 |
  Different grade | 0.07 |
 Elementary | |
  Same class | 0.7 |
  Same grade | 0.07 |
  Different grade | 0.035 |
 Junior high school | |
  Same class | 0.7 |
  Same grade | 0.07 |
  Different grade | 0.035 |
 High school | |
  Same class | 0.7 |
  Same grade | 0.07 |
  Different grade | 0.035 |
 College | |
  Same class | 0.5 |
  Different group | 0.004 |
 Workplace | 0.7 |
Casual | |
 Own school district | 0.0001 |
 Central school district | 0.00006 |
 Other school district | 0.00004 |