Aim The rapid spread of a novel human coronavirus SARS‐CoV‐2 led to drastic measures world‐wide. Most countries were forced to declare a national lockdown. We studied the effect of lockdown measures on the level of asthma control and maintenance treatment in children with recurrent wheezing and asthma during the first wave of COVID‐19 in Spain. Methods We analysed children with recurrent wheezing or asthma before and after the implementation of the lockdown, by using a questionnaire aimed to examine pre‐existing respiratory disorders, step treatment and level of asthma control before/after lockdown, COVID history and laboratory testing including IgG SARS‐CoV‐2. Results We enrolled 475 asthmatic and pre‐school wheezers (60.6% males), mean age 5.6 years. There were no differences in asthma treatment comparing both periods: 81.7% maintained the same treatment ( P = 0.103). According to child asthma‐control questionnaire, 87.7% remained well controlled during confinement. Nearly, a third of children (34.9%) needed reliever treatment, mainly in older children. Determination of IgG SARS‐CoV‐2 was performed in 233 children (49.1%) of whom 17 (7.3%) tested positive. Seven patients positive to IgG SARS‐CoV‐2 were assisted in the emergency department and two required hospital admission. Conclusions During COVID‐19 lockdown in Spain, most children with recurrent wheezing and asthma remained well controlled from their underlying disease and did not modify greatly their maintenance treatments. Unexpectedly, we also observed that those children who tested positive to SARS‐CoV‐2 IgG showed a significant increase in paediatric hospital admissions and attendances to urgent care settings.

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