Adverse Reactions to Anti-Infective Vaccines: an Emerging Problem in the COVID-19 Era.

Purpose of review: Vaccines are an essential tool for preventing infectious diseases and reducing associated morbidity and mortality. Vaccination has a significant impact at both individual and community levels, and COVID-19 vaccination programs are a new example of the great value of this public health strategy. However, adverse reactions, especially severe reactions such as anaphylaxis, prevent these programs from progressing properly, thus limiting vaccination uptake in the population. Recent findings: The frequency of reactions and types of vaccine components, with special attention to COVID-19 vaccines studies, provides information on the magnitude and causes of adverse events. The understanding of mechanisms involved has made it possible to adequately guide diagnosis, especially to COVID-19 vaccine components, such as polyethylene glycol, trometamol, and polysorbate-80. Summary: This review focuses on adverse reactions to vaccines, with emphasis on allergic reactions. A diagnostic pathway is suggested that, on the one hand, enables to take the necessary precautions in persons with a history of allergy to vaccine components or allergic reactions to vaccines and, on the other, supports administration of subsequent doses. The overall objective is to ensure that people with allergy can be vaccinated in the same way as the rest of the population, and that they are offered alternatives where necessary.

Effect of the SARS-CoV-2 pandemic on the control and severity of pediatric asthma.

BACKGROUND: The novel disease caused by the new coronavirus SARS-CoV-2 has caused an unprecedented global pandemic. Care providers of asthmatic children are increasingly con-cerned; as viral infections are one of the primary triggers of asthma flare-up. However, the effect of SARS-CoV-2 as well as the generated worldwide lockdown on asthmatic children is unknown. OBJECTIVE: The aim of this study was to analyze the effects of pandemic SARS-CoV-2 in pediat-ric asthma control. MATERIAL AND METHODS: A retrospective, open, transversal study was performed at five ter-tiary hospitals. Recruited patients were aged <18 years and had physician-diagnosed asthma. Information regarding the 2019 and 2020 seasons were provided. RESULTS: Data were collected from 107 children (age range: 3-18 years, mean age: 12 years). Well-controlled asthma was observed in 58 (54.2%) patients in 2020 versus 30 (28%) in 2019, and 15 (14%) patients had poorly controlled asthma in 2020 versus 28 (26.2%) in 2019. In 2020, a decrease in exacerbations caused by allergies to pollen, dust mites, molds, and through other causes not related to SARS-CoV-2 infection was observed. An increase in exacerbations was observed due to animal dander, stress, physical exercise, and SARSCoV-2 infection. Children had a reduced need for asthma-controlling medication, made fewer visits to healthcare providers and had lesser need of treatment with oral corticosteroids if compared with the same season of 2019. CONCLUSION: Pediatric asthma control improved, the need for controller medication declined, and fewer visits to healthcare providers were made during the pandemic if compared with the 2019 season.

Pediatric Asthma Management During the COVID-19 Pandemic: Results of a National Survey.

Background: During the COVID-19 pandemic specialists were concerned about how to achieve the best control of pediatric asthmatic patients. Methods: A national survey was performed. Analysis of the mean of follow-up, complementary tests, health system (public/private/both), availability of severe asthma units, and geographic location (cities with high COVID-19 prevalence vs. other cities with low prevalence). Differences were analyzed using contingency tables and Pearson's chi-squared test. Results: We obtained 95 responses, mostly from cities with a high disease prevalence (39; 52%). Only 29 (38.6%) of respondents provided care in a severe asthma unit. Severe asthmatic children were followed up mainly by telephone (68; 90.7%) and by in-person visits (32; 42.7%). Face-to-face care was less frequent in cities with a high prevalence of COVID-19 when compared with smaller cities (P = 0.044). Some of the surveyed physicians had discontinued patient follow-up as they were caring for patients with COVID-19 (7; 9.3%). Of all specialists surveyed, 45.3% did not evaluate severe asthmatic children with any means of testing. Pulmonary function tests were scarcely implemented. Blood tests were the most common test performed (45.3%). Specialists working in a severe asthma unit carried out more pulmonary function tests (P = 0.019). Peculiarly, moderate persistent asthmatics underwent more spirometries in cities with a high prevalence rate (P = 0.03). Follow-up of asthmatic children during the pandemic was perceived to be reduced or altogether inexistent by 42.7% of respondents when compared with a similar season outside of this emergency situation. Remarkably, the perception that better management of asthma was delivered during the pandemic by those working in cities with a high prevalence of COVID-19 versus other regions. Conclusions: Pediatric asthma control is crucial to decrease the future risk presented by the condition. New technologies and severe asthma units may become key tools in global health emergencies such as the COVID-19 pandemic.