The seven patients with transient morbidities recovered fully from the deficits within several months (mean, 1 month; range, 3 days to 6 months).
Among these patients, two patients exhibited transient neurological morbidities including coordination disturbance of hand and motor weakness of contralateral leg (cases 10 and 17 in Table 4).
However, longitudinal data do not indicate that reductions in transmission intensity lead to transient increases in morbidity and mortality.
We do not believe that this has occurred because rates of respiratory morbidity, especially transient tachypnoea, were similar between groups.
However, these studies on persistent frequent attendance used different definitions of frequent attenders and lacked the power to detect differences in morbidity between transient and persistent frequent attenders.
Another study showed that early RSV infection predisposes children to recurrent wheezing during their early childhood but that airway morbidity is transient and subsides during school age [ 13].
The findings of the IMPROVE study emphasize the importance of intraoperative lung-protective ventilation on perioperative morbidity, and even transient exposure can show significant improvement of outcomes.
Table 2 shows prevalence data with weighted percentages and ORs (adjusted for age, sex, social class, cognition and cardiovascular morbidities) of reported transient neurological symptoms at baseline by demographic factors and comorbidities.
Our study shows that late preterm infants develop high rates of transient tachypnoea (around 23%) and neonatal morbidity, confirming observations reported over the past decade from a range of different settings.
