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Gastrointestinal (GI) symptoms1 2 and positive stool severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) detection3 have been reported in COVID-19 infected patients. However, these studies mainly focused on the adult population, and it is still not known whether children with COVID-19 have similar GI involvement.
We here report the clinical characteristics of 244 consecutive COVID-19 positive children from Wuhan, during the period 21 January to 20 March 2020. All were confirmed to have SARS-CoV-2 by reverse transcription-polymerase chain reaction (RT-PCR) on nasopharyngeal swabs. We specifically compared the differences between patients with and without GI symptoms (having at least one of the following: diarrhoea; nausea and vomiting; abdominal pain; and decreased feeding). In our cohort, 34 of 244 (13.9%) presented with GI symptoms on admission. These patients were much younger (14 vs 86 months; p<0.05), and more than half were under 3 years old.
For the clinical and laboratory parameters, patients with GI symptoms were more likely to have fever on admission (70.6% vs 35.7%, p<0.05) (table 1). No other significant differences were found between the two groups, including respiratory symptoms, the duration of RT-PCR positivity for COVID-19 and CT of the thorax.
One result of interest was the high positivity rate of stool SARS-CoV-2 RT-PCR for 105 patients tested, even in patients without any GI symptoms (7/17 (37.1%)) and those completely asymptomatic (6/18 (33.3%)). Using multivariate analysis, age and presence of fever were the only significant predictive factors for GI symptoms on admission.
When we plotted the whole cohort against admission dates (median admission date: 18th February), we found that more GI patients were admitted in the early period (26 vs 7; p<0.001). Conversely, patients admitted after 18 February were mostly asymptomatic (47 vs 4; p<0.001) (figure 1).
A percentage of 13.9 of our cohort presented with GI symptoms (11.6% in adults, 30% in one small paediatric study).1 2 4 5 We also found that infants (younger than 2 years old) were more likely to present with GI symptoms than older children. The reason for this difference is not yet clear. Although our results support the findings by Jin et al 1 that GI symptoms were associated with fever, the presence of fever in children did not correlate with disease severity.
Previous reports suggested that the presence of GI symptoms in patients with COVID-19 meant the faecal–oral route could be a possible route of transmission.5–7 We did not find any difference in faecal nucleic acid RT-PCR between children with or without GI symptoms. In fact, a high proportion of asymptomatic children were also found to have positive RT-PCR in stool. Our findings would therefore suggest RT-PCR detection of the virus was not due to gut infection but coming instead from the respiratory tract from swallowed sputum. Although detection of viral RNA without additional virological evidence does not necessarily imply infection and faecal–oral spread, live SARS-CoV-2 detected on electron microscopy in stool samples8 and elevated concentrations of SARS-CoV-2 detected in patients’ toilet areas9 in recent reports mean that faecal–oral transmission remains a possibility. Contact precaution should be exercised in dealing with the excreta of patients with COVID-19, whether they have GI symptoms or not.
In contrast to adult series,10 11 our study showed a downward trend of children presenting with GI symptoms over time. Furthermore, most of the children were infected via family contact (85.2%) rather than community acquired. As the epidemic progressed in Wuhan, more diagnostic tests done led to earlier disease detection through contact screening. This observation could be useful for public health planning in countries still experiencing the early stage of the pandemic. An increase in asymptomatic infections also means the public should remain on guard at all times.
X-lX, KK-yW and S-qC are joint first authors.
Twitter @hk_kennethwong, @email@example.com
Correction notice This article has been corrected since it published Online First. The author affiliations 1, 3, 4, 5 and 9 have been amended.
Contributors Acquisition, analysis and interpretation of data: X-lX, KW, S-qC, A-fZ, J-qT and L-sZ; drafting the work or revising it critically for important intellectual content: KW, PH-yC, GC, KT, IW, CC, XL, MY-wK, G-qC, KL, WH-sW, MH-kH and GC-fC; final approval of the version published and agreement to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work: PI, PC, S-tT and PT.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.
Patient consent for publication Not required.
Ethics approval This study was approved by the Research Ethics Board of Wuhan Children's Hospital (WHCH2020022).
Provenance and peer review Not commissioned; externally peer reviewed.
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