Publications by authors named "Jiratchaya Sophonphan"

Background: Widespread access to antiretroviral therapy (ART) has led to near-normal life expectancies for people living with HIV (PLHIV), shifting the leading cause of death (COD) from AIDS-related to non-AIDS-related mortality. We assessed trends in COD among PLHIV who initiated ART in Thai National AIDS Program (NAP).

Methods: We analysed NAP data from PLHIV aged ≥15 at ART initiation, who started ART under Thailand's universal health coverage from 2008 to 2021.

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Background: Rates of carbapenem-resistant Acinetobacter baumannii are rising in Thailand. Although high-dose (HD) sulbactam is recommended for treating carbapenem-resistant A. baumannii infections, data on plasma sulbactam concentrations in children are limited.

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Background And Aims: The long-term respiratory sequelae of COVID-19 infection in children remain poorly understood and may differ across countries. This study aims to investigate the respiratory sequelae, including residual respiratory symptoms and pulmonary function in Thai children. The secondary aim is to identify factors associated with the respiratory sequelae.

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Article Synopsis
  • Healthcare-associated infections (HAIs) in hospitalized pediatric patients were studied, revealing a prevalence of 3.9% across various age groups in 41 hospitals in Thailand from March to May 2021.
  • * Significant risk factors for HAIs included longer hospital stays and the use of central venous catheters, with the highest odds of infection noted in patients with prolonged stays and LRTIs being the most common type of HAI.
  • * The findings underscore the need for strategies to reduce hospital length of stay and improve infection control practices, emphasizing ongoing surveillance of HAIs in pediatric care settings.
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Article Synopsis
  • ChulaCov19 mRNA vaccine showed good safety and immune response results in a phase 1 trial involving 150 healthy adults aged 18-59.
  • Participants received either the vaccine or a placebo, with most side effects being mild and temporary.
  • By day 50, the vaccine produced high levels of neutralizing antibodies and strong T-cell responses, indicating its potential effectiveness.
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Radiation-induced hypothyroidism (RHT) is a common long-term complication for nasopharyngeal carcinoma (NPC) survivors. A model using clinical and dosimetric factors for predicting risk of RHT could suggest a proper dose-volume parameters for the treatment planning in an individual level. We aim to develop a multivariable normal tissue complication probability (NTCP) model for RHT in NPC patients after intensity-modulated radiotherapy or volumetric modulated arc therapy.

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Article Synopsis
  • Study focuses on the immunogenicity of varying doses of the BNT162b2 vaccine for children aged 6 months to under 5 years, particularly comparing those previously infected with COVID-19 and those who are COVID-naïve.
  • Enrollment included children who had COVID-19 during the Omicron wave, with two groups receiving 2 doses of the vaccine and a control group receiving 3 doses.
  • Results showed that children post-infection (Groups A and B) had significantly higher neutralizing antibody levels against Omicron variants compared to COVID-naïve children who received the standard 3-dose regimen.
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Background: Pulmonary tuberculosis (TB) remains a major public health problem in Thailand. TB causes chronic disease which may cause physical disability, mental and socioeconomic problems in TB patients. Mental disorders may occur after TB infection or co-exist with the disease.

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Diminished immune response after vaccination occurs in cancer patients. This observational study evaluated the immune response and safety profile after COVID-19 vaccination in radiotherapy patients. The study comprised 53 cancer patients undergoing radiotherapy and voluntarily received the COVID-19 vaccine.

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Article Synopsis
  • The study highlights an increasing prevalence of syphilis among adolescents and young adults, emphasizing the potential benefits of rapid diagnostic tests for diagnosis and treatment.
  • A cross-sectional study was conducted on 200 young men and transgender women in Bangkok, revealing a syphilis prevalence of 10.5%, particularly higher among those living with HIV.
  • The RDTs used demonstrated high sensitivity (85.7% for one test) and perfect specificity (100%), suggesting they are effective tools for quick diagnosis in sexual health clinics with high syphilis rates.
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Background: A consensus on the definition of prolonged mechanical ventilation (PMV) for children does not exist. There is still lack of published work presenting the epidemiology, risk factors and outcomes at different cut-points for PMV patients. These are important for planning the goals of treatment and counseling of the prognosis for patient families.

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Objectives: To evaluate the immunogenicity of an extended interval regimen of BNT162b2 among healthy school-age children.

Methods: A randomized-control trial conducted among healthy Thai children aged 5-11 years. Participants received two doses of BNT162b2 with an 8-week (extended dosing) vs 3-week interval.

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Objectives: To describe the antibiotic use among hospitalized patients in Thailand.

Methods: A standardized cross-sectional point prevalence survey (PPS) modified from the WHO PPS protocol was conducted in 41 selected hospitals in Thailand. All inpatients who received an antibiotic at 9 a.

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Effective mRNA SARS-CoV-2 vaccines are available but need to be stored in freezers, limiting their use to countries that have appropriate storage capacity. ChulaCov19 is a prefusion non-stabilized SARS-CoV-2 spike-protein-encoding, nucleoside-modified mRNA, lipid nanoparticle encapsulated vaccine that we report to be stable when stored at 2-8 °C for up to 3 months. Here we report safety and immunogenicity data from a phase I open-label, dose escalation, first-in-human trial of the ChulaCov19 vaccine (NCT04566276).

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Primary series vaccination with BNT162b2 followed by a booster 5 months later has been recommended for healthy adolescents. We aimed to describe the immunogenicity in a fractional dose of BNT162b2. Adolescents aged 12-18 years were randomized into six arms for primary series administration: 3wPZ30/30 (reference group), 3wPZ30/20, 3wPZ20/20, 6wPZ30/30, 6wPZ30/20, and 6wPZ20/20 μg.

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Background: A primary series of 2-dose SARS-CoV-2 vaccines based on an ancestral strain generate inadequate neutralizing antibodies against the SARS-CoV-2 Omicron variant. This study aimed to describe the immune response from giving healthy school-aged children who previously received 2 inactivated vaccines an mRNA BNT162b2 booster.

Methods: Healthy children aged 5-11 years who received 2 doses of CoronaVac or Covilo were enrolled and received 10 µg BNT162b2 intramuscularly.

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Background: Heterologous prime-boost SARS-CoV-2 vaccination is a widely accepted strategy during the COVID-19 pandemic, which generated a superior immune response than homologous vaccination strategy.

Objective: To describe immunogenicity of heterologous prime-boost vaccination with inactivated vaccine, CoronaVac, followed by BNT162b2 and 5-month booster dose with BNT162b2 in healthy Thai adolescents.

Methods: Adolescents aged 12-18 years were randomized 1:1:1:1 to receive CoronaVac (SV) followed by BNT162b2 (PZ) 30 or 20 µg at either 3- or 6-week interval (SV3w/PZ30µg, SV3w/PZ20µg, SV6w/PZ30µg or SV6w/PZ20µg).

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To achieve the goal of measles elimination, herd immunity with 95% seroprotection in the community is required. This study aimed to describe the measles seropositivity rate among Thai children and adolescents. A cross-sectional study was conducted among children aged 3−18 years in Bangkok and its suburbs.

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In the era of globally predominant omicron strains, a COVID-19 booster vaccine is needed. Our study aimed to evaluate the immunogenicity of a half-dose BNT162b2 booster after AZD1222 in healthy adults. A randomized trial of volunteers aged 18-69 years who received two-dose AZD1222 was conducted.

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Adolescents with underlying diseases are at risk of severe COVID-19. The immune response of BNT162b2 may be poor among immunocompromised adolescents. We aim to describe immunogenicity of mRNA BNT162b2 among adolescents who are immunocompromised or have chronic diseases.

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Inactivated SARS-CoV-2 vaccine (CoronaVac) is commonly used in national immunization programs. However, the immune response significantly declines within a few months. Our study assessed the immune response against SARS-CoV-2 after receiving booster shots of BNT162b2 or ChAdOx1 among health care workers who previously received CoronaVac as their primary immunization.

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Background: Currently, booster dose is needed after 2 doses of non-live COVID-19 vaccine. With limited resources and shortage of COVID-19 vaccines, intradermal(ID) administration might be a potential dose-sparing strategy.

Objective: To determine immunologic response and reactogenicity of ID ChAdOx1 nCoV-19 vaccine (AZD1222,Oxford/AstraZeneca) as a booster dose after completion of 2-dose CoronaVac(SV) in healthy adult.

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Objectives: To compare the unbound plasma meropenem concentrations at mid-dosing intervals (C, 50%fT), end-dosing intervals (C, 100%fT), and proportions of patients achieving 50%fT and 100%fT above minimum inhibitory concentration (MIC) (50%fT and 100%fT) between extended infusion (EI) and intermittent bolus (IB) administration in a therapeutic drug monitoring (TDM) program in children.

Methods: A prospective observational study was conducted in children aged 1 month to 18 years receiving meropenem every 8 hours by either EI or IB. Meropenem C, C, and proportions of patients achieving 50%fT and 100%fT were compared.

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Background: Antiretroviral therapy (ART) is known to reduce tuberculosis (TB) incidence among people living with HIV (PLWH). However, studies describing the impact of long-term ART and CD4 count recovery on TB incidence remain scarce due to limited follow up in previous studies. We evaluated TB incidence in a long-term cohort of PLWH on ART in Thailand.

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