Durable SARS-CoV-2 B cell immunity after mild or severe disease

COVID-19 Infection in Children: Diagnosis and Management

Purpose of Review

Due to the rapidly changing landscape of COVID-19, the purpose of this review is to provide a concise and updated summary of pediatric COVID-19 diagnosis and management.

Recent Findings

The relative proportion of pediatric cases have significantly increased following the emergence of the Omicron variant (from < 2% in the early pandemic to 25% from 1/27 to 2/3/22). While children present with milder symptoms than adults, severe disease can still occur, particularly in children with comorbidities. There is a relative paucity of pediatric data in the management of COVID-19 and the majority of recommendations remain based on adult data.

Summary

Fever and cough remain the most common clinical presentations, although atypical presentations such as "COVID toes," anosmia, and croup may be present. Children are at risk for post-infectious complications such as MIS-C and long COVID. Nucleic acid amplification tests through respiratory PCR remain the mainstay of diagnosis. The mainstay of management remains supportive care and prevention through vaccination is highly recommended. In patients at increased risk of progression, interventions such as monoclonal antibody therapy, PO Paxlovid, or IV remdesivir × 3 days should be considered. In patients with severe disease, the use of remdesivir, dexamethasone, and immunomodulatory agents (tocilizumab, baricitinib) is recommended. Children can be at risk for thrombosis from COVID-19 and anticoagulation is recommended in children with markedly elevated D-dimer levels or superimposed clinical risk factors for hospital associated venous thromboembolism.

Comprehensive Flow Cytometry Profiling of the Immune System in COVID-19 Convalescent Individuals

SARS-CoV-2 has infected more than 200 million people worldwide, with more than 4 million associated deaths. Although more than 80% of infected people develop asymptomatic or mild COVID-19, SARS-CoV-2 can induce a profound dysregulation of the immune system. Therefore, it is important to investigate whether clinically recovered individuals present immune sequelae. The potential presence of a long-term dysregulation of the immune system could constitute a risk factor for re-infection and the development of other pathologies. Here, we performed a deep analysis of the immune system in 35 COVID-19 recovered individuals previously infected with SARS-CoV-2 compared to 16 healthy donors, by flow cytometry. Samples from COVID-19 individuals were analysed from 12 days to 305 days post-infection. We observed that, 10 months post-infection, recovered COVID-19 patients presented alterations in the values of some T-cell, B-cell, and innate cell subsets compared to healthy controls. Moreover, we found in recovered COVID-19 individuals increased levels of circulating follicular helper type 1 (cTfh1), plasmablast/plasma cells, and follicular dendritic cells (foDC), which could indicate that the Tfh-B-foDC axis might be functional to produce specific immunoglobulins 10 months post-infection. The presence of this axis and the immune system alterations could constitute prognosis markers and could play an important role in potential re-infection or the presence of long-term symptoms in some individuals.