Sustained Low Incidence of Severe and Fatal COVID-19 Following Widespread Infection Induced Immunity after the Omicron (BA.1) Dominant in Gauteng, South Africa: An Observational Study.

We conducted an epidemiologic survey to determine the seroprevalence of SARS-CoV-2 anti-nucleocapsid (anti-N) and anti-spike (anti-S) protein IgG from 1 March to 11 April 2022 after the BA.1-dominant wave had subsided in South Africa and prior to another wave dominated by the BA.4 and BA.

Population Immunity and Covid-19 Severity with Omicron Variant in South Africa.

Background: The B.1.1.

Firearm and nonfirearm homicide in 5 South African cities: a retrospective population-based study.

Objective: We assessed the effectiveness of South Africa's Firearm Control Act (FCA), passed in 2000, on firearm homicide rates compared with rates of nonfirearm homicide across 5 South African cities from 2001 to 2005.

Methods: We conducted a retrospective population-based study of 37 067 firearm and nonfirearm homicide cases. Generalized linear models helped estimate and compare time trends of firearm and nonfirearm homicides, adjusting for age, sex, race, day of week, city, year of death, and population size.

Evaluating the construct of triage acuity against a set of reference vignettes developed via modified Delphi method.

Objective: To evaluate the construct of triage acuity as measured by the South African Triage Scale (SATS) against a set of reference vignettes.

Methods: A modified Delphi method was used to develop a set of reference vignettes. Delphi participants completed a 2-round consensus-building process, and independently assigned triage acuity ratings to 100 written vignettes unaware of the ratings given by others.

The South African Triage Scale (adult version) provides reliable acuity ratings.

Objective: To estimate the inter- and intra-rater reliability of triage ratings on Emergency Centre patients by South African nurses and doctors using the South African Triage Scale (SATS).

Methods: A cross-sectional reliability study was performed. Five emergency physicians and ten enrolled nursing assistants independently assigned triage categories to 100 written vignettes unaware of the ratings given by others.

Limitations in validating emergency department triage scales.

Objective: To examine whether current validation methods of emergency department triage scales actually assess the instrument's validity.

Methods: Optimal methods of emergency department triage scale validation are examined in developed countries and their application to developing countries is considered.

Results And Conclusion: Numerous limitations are embedded in the process of validating triage scales.

Addressing the challenges of underdevelopment in environmental and occupational health in southern Africa.

Since 1996, the University of Michigan's Fogarty International Center training and research program in Environmental and Occupational Health (EOH) in Southern Africa has contributed to capacity development in the 14 countries of the Southern African Development Community. Methods include training citizens from the region in master's, doctoral, and short-term focused programs; assisting the development of graduate programs in EOH at institutions, developing resources for distance-based degree programs; direct support ofjunior and mid-level researchers, and organizing regional short courses and regional conferences. Substantial EOH resources now present in South Africa are leveraged to assist capacity development in the rest of the region.

The relationship between reproductive outcome measures in DDT exposed malaria vector control workers: a cross-sectional study.

Background: The utility of blood reproductive endocrine biomarkers for assessing or estimating semen quality was explored.

Methods: A cross-sectional study of 47 DDT exposed malaria vector control workers was performed. Tests included blood basal and post gonadotrophin releasing hormone (GnRH), luteinizing hormone (LH), follicle stimulating hormone (FSH), testosterone, sex hormone binding globulin (SHBG), estradiol (E2) and inhibin; a questionnaire (demographics and general medical history); a physical examination and semen analysis.

Evaluation of an HIV/AIDS peer education programme in a South African workplace.

Objectives: To evaluate a South African workplace HIV/AIDS peer-education programme running since 1997.

Methods: In 2001 a cross-sectional study was done of 900 retail-section employees in three geographical areas. The study measured HIV/AIDS knowledge, attitudes towards people living with HIV/AIDS, belief about self-risk of infection, and condom use as a practice indicator.

Exploration of different methods for measuring DDT exposure among malaria vector-control workers in Limpopo Province, South Africa.

DDT compounds are used in many developing countries, including South Africa, for the control of malaria vectors. This study investigated biological exposures among workers in relation to job history. A cross-sectional study of 59 workers at the Malaria Control Centre (MCC) in Tzaneen, South Africa, was performed.

The hormonal effects of long-term DDT exposure on malaria vector-control workers in Limpopo Province, South Africa.

DDT [1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane] compounds, used in many developing countries, including South Africa, for the control of malaria vectors, have been shown to be endocrine disruptors in vitro and in vivo. The study hypothesis was that male malaria vector-control workers highly exposed to DDT in the past should demonstrate clinically significant exposure-related anti-androgenic and/or estrogenic effects that should be reflected in abnormalities in reproductive hormone levels. A cross-sectional study of 50 workers from three camps situated near the Malaria Control Center (MCC) in Tzaneen was performed.

The nervous system effects of occupational exposure on workers in a South African manganese smelter.

Five hundred and nine production workers at a manganese (Mn) smelting works comprising eight production facilities and 67 external controls were studied cross-sectionally for Mn related neuroehavioural effects. Exposure measures from personal sampling included Mn in inhalable dust as cumulative exposure indices (CEI) and average intensity (INT). Biological exposure and biological effect measures included blood (MnB), urine (MnU) manganese and serum prolactin.

The utility of biological monitoring for manganese in ferroalloy smelter workers in South Africa.

Five hundred and nine workers at a manganese (Mn) smelting works comprising eight production facilities and 67 external controls were studied cross-sectionally. Exposure measures from personal sampling included inhalable dust, cumulative exposure indices (CEI) and average intensity (INT = CEI/years exposed) calculated for the current job at the smelter and also across all jobs held by subjects. Biological exposure was measured by Mn in the blood (MnB) and urine (MnU) and biological effect was measured by serum prolactin.

Nervous system effects of occupational manganese exposure on South African manganese mineworkers.

Occupational exposure to airborne manganese dust has been shown to produce adverse effects on the central nervous system. Four hundred and eighty-nine blue and white collar manganese mineworkers from South Africa were studied cross-sectionally to investigate the nervous system effects of medium to low occupational manganese exposures. The different facilities included underground mines, surface processing plants, and office locations.