RESUMO
Background: Children 6 months to < 5 years old are recommended to receive 3-dose regimen of BNT162b2. Children previously infected with Omicron variant of SARS-CoV-2 develop immunity from natural infection, therefore may require fewer doses of vaccine. Objective: To compare immunogenicity of 1- or 2-dose BNT162b2 in healthy children post COVID-19 with 3-dose BNT162b2 in COVID-naïve children. Methods: Children aged 6 months to < 5 years who developed COVID-19 during the Omicron-predominant period were enrolled; Group A 3-6 months(N = 40) and Group B > 6 months(N = 40) prior to vaccination. Participants in Group A and B received 2-dose BNT162b2 intramuscularly 1 month apart. COVID-naïve children were enrolled as a control group (N = 40) and received 3-dose BNT162b2 at month 0,1,3. Neutralizing antibody against Omicron variant(BA.2.75 and BA.4/5) was determined by pseudovirus assays(pVNT) as reported by neutralization dilution for 50%inhibition (ID50) at 28 days after the 1st and 2nd dose. Results: From October-November 2022, 120 children with a median age of 2.8 years (IQR 1.6-4.0) were enrolled. The median duration since COVID-19 to vaccination was 4.4 months(IQR 3.8-5.4) in Group A and 7.9 months(7.0-8.5) in Group B. In Group A, the geometric means(GMs) of pVNT-BA.2.75 ID50 were 553 (95%CI 338-906) and 753(516-1098) after 1 and 2 doses, respectively, and the GMs of pVNT-BA.4/5 ID50 were 1936(1402-2673) and 1885(1414-2512), respectively. In Group B, the GMs of pVNT-BA.2.75 ID50 were 1383(1100-1742) and 1419 (1104-1823), and the GMs of pVNT-BA.4/5 ID50 were 2627(2048-3367) and 2056(1546-2735), respectively. Meanwhile in COVID-naïve group, the GMs of pVNT-BA.2.75 and pVNT-BA.4/5 ID50 were 158(98-255) and 59(31-114) after the 3rd dose, respectively. The geometric mean ratio(GMR) of pVNT-BA.2.75 ID50 after 1 dose in Group A and B compared with after 3 doses in COVID-naïve group were 3.50 (1.93-6.34) and 8.74 (4.79-15.95), respectively. The GMR of pVNT-BA.2.75 ID50 after 1 dose in Group B compared with Group A was 2.50 (1.45-4.31). Conclusions: Children previously infected with SARS-CoV-2 Omicron variant, developed robust neutralizing antibody response against Omicron variant after single-dose BNT162b2. Children with an interval of > 6 months since COVID-19 infection developed higher neutralizing antibody response compared to those with a 3-to-6-month interval.
RESUMO
Alteration of nutrient metabolism during hospital stay may cause a deterioration in patients' nutritional status. The aim of this study was to determine the prevalence and possible risk factors for nutritional deterioration in hospitalized children. A multicentre prospective study was conducted among the patients aged 1 month to 18 years in tertiary-care hospitals, between December 2018 and May 2019. Demographic data, illness, and nutritional assessment on the first and the last day of admission were collected. There were 623 patients enrolled in this study with the median age of 4.3 years. Two thirds of the patients had at least one underlying disease. Eighty-eight percent of the patients were admitted with mild medical conditions including a scheduled cycle of chemotherapy or immunosuppressive drugs, minor infection, and non-invasive procedures. The prevalence of nutritional deterioration (reduction in body mass index ≥ 0.25 Z-score) was 24% and was associated with a significantly higher rate of nosocomial infection (24% vs. 11%, p < 0.001) compared to patients without hospital-acquired malnutrition. Risk factors included moderate to severe medical conditions (AOR 1.90, 95% CI 1.09-3.31, p = 0.024), pneumonia (AOR 1.85, 95% CI 1.05-3.28, p = 0.034), seizure (AOR 2.82, 95% CI 1.28-6.19, p = 0.01), and surgery (AOR 2.98, 95% CI 1.60-5.56, p = 0.001). Nutritional management showed a significant reduction in the incidence of hospital-acquired malnutrition and a trend towards a 60% decrease in infectious complications in patients with moderate to severe medical conditions.Conclusions: Approximately one fourth of paediatric patients developed malnutrition during hospitalization. Nutritional screening, assessment, and treatment should be implemented to improve the outcomes of hospitalized paediatric patients. What is Known: ⢠Malnutrition at admission has a negative impact on outcomes of patients, including prolonged hospitalization, increased costs of care, and a higher rate of nosocomial infection. What is New: ⢠Hospital-acquired malnutrition can occur regardless of prior nutritional status and is predominantly related to illness severity. ⢠Malnourished patients with nutritional intervention experience an improvement in their nutritional status as well as a lower risk of developing hospital morbidity during hospitalization.
