Informing the pandemic response: the role of the WHO's COVID-19 Weekly Epidemiological Update

On 31 December 2019, the Municipal Health Commission of Wuhan, China, reported a cluster of atypical pneumonia cases. On 5 January 2020, the WHO publicly released a Disease Outbreak News (DON) report, providing information about the pneumonia cases, implemented response interventions, and WHO's risk assessment and advice on public health and social measures. Following 9 additional DON reports and 209 daily situation reports, on 17 August 2020, WHO published the first edition of the COVID-19 Weekly Epidemiological Update (WEU). On 1 September 2023, the 158th edition of the WEU was published on WHO's website, marking its final issue. Since then, the WEU has been replaced by comprehensive global epidemiological updates on COVID-19 released every 4 weeks. During the span of its publication, the webpage that hosts the WEU and the COVID-19 Operational Updates was accessed annually over 1.4 million times on average, with visits originating from more than 100 countries. This article provides an in-depth analysis of the WEU process, from data collection to publication, focusing on the scope, technical details, main features, underlying methods, impact and limitations. We also discuss WHO's experience in disseminating epidemiological information on the COVID-19 pandemic at the global level and provide recommendations for enhancing collaboration and information sharing to support future health emergency responses.

WHO's Investigations and Studies, Unity Studies: A global initiative creating equitable opportunities for enhanced surveillance, operational research, capacity building, and global knowledge sharing

The World Health Organization's Unity Studies global initiative provides a generic preparedness and readiness framework for conducting detailed investigations and epidemiological studies critical for the early and ongoing assessment of emerging respiratory pathogens of pandemic potential. During the COVID-19 pandemic, the initiative produced standardized investigation protocols and supported Member States to generate robust and comparable data to inform public health decision making. The subsequent iteration of the initiative is being implemented to develop revised and new investigation protocols, implementation toolkits and work to build a sustainable global network of sites, enabling the global community to be better prepared for the next emerging respiratory pathogen with epidemic or pandemic potential.

Introducing seasonal influenza vaccine in low-income countries: an adverse events following immunization survey in the Lao People's Democratic Republic

Objective

In 2012, Lao PDR introduced seasonal influenza vaccine in pregnant women, persons aged ≥50 years, persons with chronic diseases, and healthcare personnel. We assessed adverse events following immunization (AEFI).

Methods

We used a multistage randomized cluster sample design to interview vaccine recipients.

Findings

Between April and May 2012, 355 902 were vaccinated. Of 2089 persons interviewed, 261 (12·5%) reported one or more AEFI. The most commonly reported AEFIs were local reactions. No hospitalizations or deaths were reported; 16% sought medical care. Acceptance and awareness of vaccination were high.

Conclusions

Following the introduction of seasonal influenza vaccine in Lao PDR, self-reported adverse events were mild.

Seroprevalence of rubella and measles antibodies in Lao PDR

BACKGROUND

Nowadays, measles and rubella epidemics still occur worldwide, particularly in developing countries.

METHODS

The present study investigated seroprevalence of rubella and measles IgG antibodies by using a comercial enzyme immunoassay. The findings helped to understand the current status of these infections in school children in Vientiane Capital, Lao PDR.

RESULTS

The seropositive rate for measles antibody was 97.6%. Most importantly, more than half of 411 healthy children (56.4%) were rubella seronegative and susceptible to acquired rubella infection.

CONCLUSIONS

The results highlight a high proportion of rubella-seronegative children, suggesting that they are susceptible to rubella and face the risk of congenital rubella syndrome. It was the first study to report on seroprevalence of rubella in Vientiane Capital, Lao PDR.

Risk factors for protein-energy malnutrition in children under 5 years: study from Luangprabang province, Laos

BACKGROUND

Laos is one of the poorest countries in which chronic malnutrition is highest. The aim of the present study was to determine the prevalence of and to identify risk factors associated with protein-energy malnutrition (PEM) in children under 5 years of age in Luangprabang province, Laos.

METHODS

This cross-sectional study was undertaken from March to May 2004. Anthropometric measurements of 798 children were done and data were transformed into height-for-age, weight-for-age and weight-for-height ratios. Mothers were also interviewed with a semi-structured questionnaire. Anthropometric data were entered into Nutstat in Epi-Info 2000 and transferred to SPSS for analysis.

RESULTS

There was a high prevalence of stunting, underweight and wasting, that is, 54.6%, 35%, and 6% respectively. It was also noted that children aged 12-23 months and Khmu ethnic children had a higher prevalence of stunting (65% and 66%) and underweight (45% and 40%), respectively. However, it was also found that boys were more prone to be stunted and underweight. Furthermore, restricted intake of meats, vegetables during illness, and low maternal education were main risk factors for child malnutrition in the study area.

CONCLUSION

Socioeconomic-demographic factors, low maternal education, poor nutrition knowledge for mother and feeding practices for sick children are affecting children's health regarding stunting and underweight. It is recommended that an improvement in societal infrastructure, better maternal education and nutrition are needed to address the child malnutrition issue.

Health-care waste management in Lao PDR: a case study

This study investigated the health-care waste (HCW) management at each health-care facility level at two selected sites in the Lao People's Democratic Republic (Lao PDR): Vientiane Municipality; and Bolikhamxay province. It focused on the amount of HCW, its segregation and the factors influencing HCW management, particularly segregation procedures. A high proportion of incorrectly segregated medical waste was found at each level of health-care facility. Re-segregation revealed 39, 62, 57 and 37% at national hospital, provincial hospital, district hospital and health centre level, respectively, was poorly segregated. The mean of generated HCW was 0.62 kg/bed per day (Vientiane Municipality) and 0.38 kg/bed per day (Bolikhamxay) at two study sites. A higher proportion of medical waste (MW) from the inpatient department at the primary health-care level was found. Thus, HCW management at primary health-care facilities needs more attention and should be better understood.