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NICD | COVID-19 VACCINE BREAKTHROUGH CASES FREQUENTLY ASKED QUESTIONS
WHY ARE SO MANY PEOPLE GETTING SICK OR TESTING POSITIVE AFTER VACCINATION, AND HOW ARE WE KEEPING TRACK OF SUCH CASES?
The vaccines are not 100% effective, so we would expect breakthrough infections. The majority of these will be mild. For the Sisonke study, so far 94% of breakthroughs were mild, 4% moderate and 2% severe.

When the rate of infection is very high there will be more breakthrough infections. Once population immunity levels rise with increased vaccination, there will be less transmission of the virus and fewer breakthrough infections. Any events that happen after vaccination must be reported so that these can be investigated. There is a Medsafety app and details can be found by visiting medsafety.sahpra.org.za.

South African Medical Research Council: SAMRC | Report on Weekly Deaths in South Africa, 29 Dec 2019 - 27 Nov 2021, illustrated
One approach to aid understanding of the emerging COVID-19 mortality is to compare the estimated weekly excess deaths with the number of COVID-19 deaths reported by the Minister of Health as shown in the figure below. This comparison is hampered to some degree by the fact that the excess deaths are classified by week in which the death occurred; the reported COVID-19 deaths are classified by date the numbers are reported to the Department. If all excess natural deaths were due to COVID-19, and all COVID-19 deaths were perfectly identified and reported, the two series would be identical. The number of estimated excess deaths has begun to decrease, consistent with the trend in the number of confirmed COVID-19 deaths. Although more data are needed on the underlying causes of death, this observation is strongly supportive that a significant proportion of the current excess mortality being observed in South Africa is likely to be attributable to COVID-19.
by Cat on Fri Dec 3rd, 2021 at 08:10:20 PM EST
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