Preliminary findings from stimulated spontaneous reporting of adverse drug reactions during COVID-19 pandemic: an experience from Ghana

Landscape review of active vaccine safety surveillance activities for COVID-19 vaccines globally

Background

Evidence of COVID-19 vaccine safety relied upon the global vaccine monitoring infrastructure due to shortened clinical development timelines and emergency use licensure. Differences in AVSS capacity between high-income countries (HICs) versus low- and middle-income countries (LMICs) were known prior to the pandemic.

Objective

To assess the global landscape of COVID-19 vaccine AVSS activities to identify gaps in safety evidence generation across vaccine products and populations with a focus on LMICs.

Methods

A cross-sectional survey was conducted in January 2022 on AVSS activities evaluating adverse events following immunization (AEFI). Data collected included country, targeted population, COVID-19 vaccine product(s), design of surveillance/monitoring activities or study, and AEFIs to be monitored.To supplement these findings, we conducted a literature review of COVID-19 vaccine safety activities published in PubMed through January 2023. Observational activities assessing AEFI, specifically adverse events of special interest (AESI), following routine use of COVID-19 vaccines in medical practice were included; systematic reviews, benefit/risk assessments, clinical trials, and case reports/series were excluded.

Results

The survey, completed by 34 respondents and compiled with reviews of 7 publicly available Risk Management Plans from five vaccine manufacturers, identified 79 monitoring activities in HICs, 24 in LMICs, and 9 in multiple regions. Most activities in LMICs were planned cohort event monitoring (CEM) studies (n = 18); two multi-national hospital-based sentinel surveillance studies for AESI were ongoing. Activities in LMICs evaluated multiple COVID-19 vaccine products simultaneously and were sponsored by health authorities. The literature review identified 1245 unique citations, of which 379 met inclusion criteria. The majority evaluated vaccines primarily used in high-income countries: Pfizer BioNTech (Comirnaty; n = 303), Moderna (mRNA-1273; n = 164), AstraZeneca (AZD1222; n = 126), and Janssen (Ad26.COV2.S); n = 62); 14 citations assessed vaccines used exclusively in LMICs: Sinovac (CoronaVac), Beijing CNBG (BBIBP-Corv), Bharat (Covaxin), SII (Covashield), and Gamaleya (Gam-Covid-Vac) vaccines.

Conclusions

Robust safety evidence for input into benefit/risk assessments is likely unavailable for most COVID-19 vaccines used primarily in LMICs due to emphasis on cohort event monitoring methods. Goals for equitable vaccine access should be coupled with investment and support for building infrastructure and capacity for safety evidence generation to inform policy and regulatory decisions at local levels.

Eventos adversos no sistema nervoso central potencialmente relacionados aos medicamentos utilizados na COVID-19: revisão de escopo

Objetivo.

Identificar eventos adversos no sistema nervoso central (SNC) potencialmente associados ao uso de medicamentos para profilaxia ou tratamento da COVID-19, bem como caracterizar os indivíduos acometidos.

Métodos.

Desenvolveu-se uma revisão de escopo a partir de estratégia de busca nas bases de dados PubMed, EMBASE, SciELO, Scopus, Cummulative Index to Nursing and Allied Health Literature (CINAHL) e Biblioteca Virtual em Saúde (BVS). Foram incluídos estudos com indivíduos que utilizaram medicamentos como medida profilática ou curativa para COVID-19 e que apresentaram ao menos um evento adverso no SNC. Foram excluídos os artigos que reportaram eventos adversos no SNC potencialmente associados a medicamentos para outras condições de saúde.

Resultados.

Recuperaram-se 1 547 artigos, dos quais oito atenderam aos critérios de elegibilidade. Em sete estudos, o desenho foi do tipo observacional. Foram analisados 3 035 indivíduos, dos quais 1 701 eram profissionais da saúde e 1 978, mulheres. A terapia mais utilizada foi a curativa (n = 5), com hidroxicloroquina, cloroquina, lopinavir/ritonavir e azitromicina. Os eventos adversos comumente descritos foram dor de cabeça, tontura, distúrbios de humor e sonolência. Suicídio foi o evento grave mais frequente. Seis eventos foram inesperados para hidroxicloroquina, cloroquina e doxiciclina (mioclonias, tremor, distúrbio de marcha, disgeusia, hiperidrose e inquietação).

Conclusão.

Os eventos adversos no SNC foram inespecíficos e, geralmente, potencialmente associados ao uso de hidroxicloroquina em monoterapia ou em associação para tratamento curativo da COVID-19. Os dados corroboram a relação desfavorável de risco/benefício desses medicamentos na prevenção e no manejo dos sinais e sintomas da infecção por SARS-CoV-2.