NATIONAL INSTITUTE FOR

COMMUNICABLE DISEASES

A division of the NATIONAL HEALTH LABORATORY SERVICE

Influenza surveillance report – South Africa

Report compiled on 9 June2011

Severe acute respiratory illness (SARI) surveillance

Reporting period: / 01/01/2011 / to / 03/06/2011 / Results until end of epidemiologic week 2011: / 22

Figure 1. Number of positive samples* by influenza types and subtypes and detection rate by week

*Specimens from patients hospitalised with severe acute respiratory infections at 4 sentinel sites in 3 provinces

Table 1. Cumulative number of identified influenza types and subtypes and total number
of samples collected by hospital
Hospital / B / A unsubtyped / A (H1N1) / A (H1N1)2009 / A (H3N2) / Total samples
Chris Hani Baragwanath (GP) / 1 / 29 / 3 / 1125
Edendale (KZ) / 0 / 1 / 351
Klerksdorp-Tshepong (NW) / 4 / 4 / 313
Mapulaneng (MP) / 1 / 1 / 91
Matikwane (MP) / 0 / 1 / 142
Total: / 6 / 0 / 0 / 36 / 3 / 2022
*Gauteng (GP), KwaZulu Natal (KZ), North West (NW), Mpumalanga (MP)

Influenza-like illness (ILI) surveillance (Viral Watch)

Reporting period: / 01/01/2011 / to / 03/06/2011 / Results until end of epidemiologic week 2009: / 22

Figure 2. Number of positive samples* by influenza types and subtypes and detection rate** by week

*Specimens from patients with Influenza-like illnesses at 223 sentinel sites in 9 provinces

**Detection rate calculated on specimens tested at NICD only, not shown before onset of season

Table 2. Cumulative number of influenza type and subtype and total number
of samples collected by province
Province / B / A unsubtyped / A (H1N1) / A (H1N1)2009 / A (H3N2) / Total samples
Eastern Cape / 1 / 8 / 2 / 38
Free State / 1 / 20
Gauteng / 8 / 129 / 2 / 508
KwaZulu-Natal / 1 / 7
Limpopo / 1 / 38 / 2 / 130
Mpumalanga / 17 / 54
Northern Cape / 3 / 30
North West / 1 / 3 / 10
Western Cape / 15 / 4 / 117
Total: / 10 / 17 / 0 / 202 / 7 / 914

Private hospital consultations

Reporting period: / 01/01/2011 / to / 06/05/2011 / Results until end of epidemiologic week 2010 / 18

Figure 3. Number of private hospital outpatient consultations* with a discharge diagnosis of pneumonia and influenza (P&I) and viral isolates**

* Hospital outpatient data from weekly reports of consultations to the Netcare hospital group.Discharge diagnosis is according to International Statistical Classification of Diseases and Related Health Problems coding/ICD by clinicians and does not represent laboratory confirmation of aetiology

** Influenza positive specimens from the Viral Watch surveillance programme

Figure 4. Number of private hospital admissions* with a discharge diagnosis of pneumonia and influenza (P&I) and viral isolates**

*Hospitalisation admission data from weekly reports of consultations to the Netcare hospital group.Discharge diagnosis is according to International Statistical Classification of diseases and Related Health Problems /ICD by clinicians and does not represent laboratory confirmation of aetiology

** Influenza positive specimens from the SARI surveillance programme

Data presented are provisional as reported to date. The number of consultations is reported by date of consultation and specimens are analysed by date of collection.

Source: SARI surveillance, Viral Watch surveillance and Hospital Consultations Netcare

Data may be freely reproduced provided due acknowledgement is given to the NICD

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