Attributable Fraction of Influenza Virus Detection to Mild and Severe Respiratory Illnesses in HIV-Infected and HIV-Uninfected Patients, South Africa, 2012–2016
, Sibongile Walaza, Jocelyn Moyes, Adam L. Cohen, Claire von Mollendorf, Meredith L. McMorrow, Florette K. Treurnicht, Marietjie Venter, Marthi Pretorius, Orienka Hellferscee, Nicole Wolter, Anne von Gottberg, Athermon Nguweneza, Johanna M. McAnerney, Halima Dawood, Ebrahim Variava, Shabir A. Madhi, and Cheryl Cohen
Author affiliations: National Health Laboratory Service, Johannesburg, South Africa (S. Tempia, S. Walaza, J. Moyes, C. von Mollendorf, F.K. Treurnicht, M. Pretorius, O. Hellferscee, N. Wolter, A. von Gottberg, A. Nguweneza, J.M. McAnerney, S.A. Madhi, C. Cohen); US Centers for Disease Control and Prevention, Atlanta, Georgia, USA (S. Tempia, A.L. Cohen, M.L. McMorrow); US Centers for Disease Control and Prevention, Pretoria, South Africa (S. Tempia, A.L. Cohen, M.L. McMorrow); University of the Witwatersrand, Johannesburg (S. Walaza, J. Moyes, C. von Mollendorf, O. Hellferscee, N. Wolter, A. von Gottberg, E. Variava, S.A. Madhi, C. Cohen); World Health Organization, Geneva, Switzerland (A.L. Cohen); University of Pretoria, Pretoria (M. Venter, M. Pretorius); Pietermaritzburg Metropolitan Hospital, Pietermaritzburg, South Africa (H. Dawood); University of KwaZulu-Natal, Pietermaritzburg (H. Dawood); Klerksdorp-Tshepong Hospital Complex, Klerksdorp, South Africa (E. Variava)
Figure 3. Estimated influenza virus attributable fraction (AF) and AF trends across age groups among inpatients with severe chronic respiratory illness, Klerksdorp and Pietermaritzburg, South Africa, May 2012–April 2016. A) HIV-infected patients (AF trends estimated using model 1, a linear model). B) HIV-uninfected patients (AF trends estimated using model 2, a quadratic model).
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