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. 2021 Jul 26;77(Suppl 2):S271–S277. doi: 10.1016/j.mjafi.2021.06.006

Table 3.

Secondary attack rate in pre and post-vaccination period.

Period Contacts tested positive Contacts Tested Negative Secondary Attack Rate p Value
Pre-Vaccination Period 54 252 21.42% <0.05
Post-Vaccination Period 02 47 4.25%