Early effects of the COVID-19 pandemic on the acute flaccid paralysis surveillance in East and Southern African countries

INTRODUCTION: the World health organisation (WHO) African Region reported the first confirmed COVID-19 case caused by the SARS-CoV-2 on 25(th) February 2020, and the first case for the East Southern Africa (ESA) sub-region was on 5(th) March 2020. Almost all countries in the ESA sub region implemented the WHO-recommended preventive measures variably after the notification of community transmission of the COVID-19 disease. This resulted in the disruption of the outpatient, immunization surveillance, and the related supply chain activities. METHODS: a comparative analysis study design of secondary acute flaccid paralysis (AFP) surveillance data received from the East and Southern Africa sub-region countries to evaluate the effect of the COVID-19 pandemic in the AFP field surveillance for the same time period of March to December 2019 and 2020. RESULTS: we observed that 52.4% of second stool samples were received in the laboratory within 72 hours from March to December 2019, and only 48.1% in the same period of 2020. A 4.3% decline with a p-value of <0.0001 (95% CI, ranges from 2.326% to 6.269%). Similarly, we noted a 4.7% decline in the number of reported AFP cases in the ESA sub-region for March to December 2020 compared to the same period in 2019, a p-value of less than 0.001 (95% CI ranges from 2.785 to 6.614). For the percentage of stool adequacy, we observed a 3.37% decline for April in 2020 compared to April 2019 with a p-value of less than 0.001 (95% CI ranges from 2.059 to 4.690). CONCLUSION: we observed a decline in the core AFP surveillance (non polio) NP-AFP rate, and percentage of stool adequacy in countries severely affected by the COVID-19 disease. These countries implemented stringent transmission prevention measures such as lock-down and international transportation restrictions.