Weather and the susceptibility of children to severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) infection is still a debated question and currently a hot topic, particularly in view of important decisions regarding opening schools. Therefore, we performed this prospective analysis of anti‐SARS‐CoV‐2 immunoglobulin G (IgG) antibodies in children with known household exposure to SARS‐CoV‐2 and compared their IgG status with the other adults exposed to the index case in the same household. A total of 30 families with a documented COVID‐19 index case were included. A total of 44 out of 80 household contacts (55%) of index patients had anti SARS‐CoV‐2 IgG antibodies. In particular, 16/27 (59,3%) adult partners had IgG antibodies compared with 28/53 (52,3%) of pediatric contacts ( p > .05). Among the pediatric population, children ≥5 years of age had a similar probability of having SARS‐CoV‐2 IgG antibodies (21/39, 53.8%) compared to those less than 5 years old (7/14, 50%) ( p > .05). Adult partners and children also had a similar probability of having SARS‐CoV‐2 IgG antibodies. Interestingly, 10/28 (35.7%) of children and 5/27 (18.5%) of adults with SARS‐CoV‐2 IgG antibodies were previously diagnosed as COVID‐19 cases. Our study shows evidence of a high rate of IgG antibodies in children exposed to SARS‐CoV‐2. This report has public health implications, highlighting the need to establish appropriate guidelines for school openings and other social activities related to childhood.

Childhood pulmonary tuberculosis (PTB) diagnosis is often a challenge that requires a combination of history, clinical, radiological, immunological and microbiological findings. Radiological diagnosis is based today on the use of chest X-ray and chest CT that, in addition to being radio-invasive tools for children, are often not available in countries with low-resources. A non-invasive, easily usable and reproducible, low-cost diagnostic tool as LUS would therefore be useful to use to support the diagnosis of childhood PTB. Data on the use of LUS for the diagnosis and follow-up of childhood PTB are limited and in some respects contradictory. To help better define the potential role of LUS we have described the pros and cons of lung ultrasound method through a brief review of the studies in the literature and reporting some case series in which we describe clinical, laboratory, radiological results as well as detailed lung ultrasound findings of four children/adolescents with PTB.

Letters to the Editor FIGURE 1. Right atrial thrombus attached to the atrial wall. A: Transesophageal echocardiographic image of the right atrium (bicaval view) demonstrating a clot (arrow) adherent to the wall of the recess between EV and Tebesio valve. B: Transesophageal echocardiographic image after 25 days demonstrating persistence of the clot (arrow) although smaller in size. C: Transesophageal echocardiographic image after 10 days demonstrating the complete resolution of the clot. D: Pulmonary infarction on chest computed tomography. EV indicates Eustachian valve; IVC, inferior vena cava.