Although the overall phase three seropositivity of 49.04% might be considered an encouraging trend for approaching community level immunity, it falls significantly short of 67%, which has been suggested as the threshold for herd immunity for SARS-CoV-2 as per published estimates [ 13 ].
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Seroprevalence of SARS-CoV-2 in Bhubaneswar, India: findings from three rounds of community surveys.
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The sentences
Analysis of seroprevalence of anti-SARS-CoV-2 antibodies showed a trend of increasing seropositivity in the sampled population at the three time points from July 2020 to September 2020.
Seroprevalence showed an increasing trend over the three time periods, with the highest seropositivity rates among individuals sampled between 16 and 18 September 2020.