- The number of reported cases per week has decreased since the implicated products were recalled on 04 March 2018 with a total of 64 cases reported since 5 March 2018 (average 6.4 cases/week), whereas 249 cases were reported for the 10-week period prior to the recall (average 24.9 cases/week).
- Prior to 2017, an average of 60 to 80 laboratory-confirmed listeriosis cases per year (approximately 1 per week), were reported in South Africa. In July 2017, an increase in laboratory-confirmed cases of listeriosis was reported to National Institute for Communicable Diseases (NICD) which was followed by investigations into the reported increase. On 05 December 2017, the listeriosis outbreak was declared by the Minister of Health, Dr. Aaron Motsoaledi. The source of the outbreak was identified as ready-to-eat processed meat products manufactured at Enterprise Foods’ Polokwane production facility. A recall of affected products was initiated on 04 March 2018.
- 1 034 cases have been reported from 01 January 2017 to 16 May 2018. The number of new cases reported each week has decreased since the implicated products were recalled on 04 March 2018 (Figure 1). Neonates ≤28 days of age are the most affected age group, followed by adults aged 15 – 49 years of age (Figure 2). Most cases have been reported from Gauteng Province (59%, 606/1 034), followed by Western Cape (13%, 130/1 034) and KwaZulu-Natal (7%, 75/1 034) provinces (Table 1).
- All clinical isolates received at NICD are undergoing whole genome sequencing (WGS). A total of 543 clinical isolates have undergone WGS to date (Figure 1); 92% (499/541) belong to the sequence type 6 (ST6) outbreak strain, and the remainder belong to thirteen different sequence types.
- Listeriosis outbreak situation report draft _21May2018_final