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Classification of the index cases and of cases identified by index case in Oswaldo Cruz School Hospital in Brazil.
| Classification | ||||
| Primary | Co-primary | Secondary | Total | |
| Index cases | 18 (35.2%) | 2(4%) | 31(60.8%) | 51 |
| Cases identified by index case | 39(36.4%) | 6(5.6%) | 62(58%) | 107 |
| Total | 57 | 8 | 93 | 158 |
