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Biomedical subjects

U Thisyakorn

Publications and source records attributed to U Thisyakorn.

At least 19 recordsLinked to original sources
PubMed2003

Stuart Gan Memorial Lecture 2002. HIV/AIDS in children.

The incidence of human immunodeficiency virus (HIV) infection and acquired immunodeficiency syndrome (AIDS) in children has risen steadily over the years and has become an increasing cause of morbidity and mortality during childhood. More than 90% of all children with HIV infection acquired their infection at birth from HIV-infected mothers. With increasing evidence of heterosexual HIV transmission, the number of infected women and consequently their children is increasing. The transmission rate of HIV from mother to infant varies from 20% to 40%. Children can be affected directly through HIV infection and AIDS, and indirectly by the effects of their parents' HIV infection, including being orphaned, discrimination, infant abandonment and negative impact on children's education. Another concern regards children who are most vulnerable to HIV infection and AIDS, such as child prostitutes and children in difficult circumstances. Recommended actions include prevention of parental HIV infection, prevention of mother-to-child HIV transmission, addressing child prostitution, prevention of child labour and improving work conditions, assistance to street children, addressing discrimination, solving the problem of children orphaned by AIDS, reducing HIV-related child abandonment and creating new roles for schools in reducing negative social impact. Although the largest number of HIV-infected persons are from sub-Saharan Africa, the annual incidence of HIV infection in Asia is escalating alarmingly. As reported by the Joint United Nations Programme on HIV/AIDS (UNAIDS) and the World Health Organization in December 2001, HIV infection has already killed more than 20 million people worldwide since the beginning of the epidemic and has infected more than 40 million people; almost half of them were women. There are at least 7 million people living with HIV/AIDS in the Asia-Pacific region. The numbers of HIV-infected women and children are increasing at an alarming rate. Over 1 million children are HIV-infected; in the year 2000 alone, 600,000 children acquired HIV infection.

Acquired Immunodeficiency Syndrome↗
PubMed2001

Immunologic and virologic evaluation of HIV-1-infected children after rabies vaccination.

BACKGROUND: One-third of Thai children experience a dog bite by the time they are 15 years old, and HIV-1 infection in children is also not uncommon. Previous study has shown that rabies vaccination of HIV-1-infected children may not result in a satisfactory antibody response when CD4+ T cells are less than 15%. The objective of this prospective clinical study is to evaluate the immunologic response and effect on viral load after rabies vaccination in HIV-infected children. METHODS: Thirteen HIV-1-infected children were vaccinated with the intramuscular rabies pre-exposure regimen using human diploid cell rabies vaccine (HDCV) on days 0, 7 and 28. CD4+ and CD8+ lymphocyte counts were performed on days 0, 7 and 28. Plasma viral loads were determined on days 0, 7, 14, 60, 90, 180 and 360. RESULTS: There were no significant change in serial measurements of CD4+/CD8+ lymphocytes during a period of 1 month and in plasma viral load during 1 year. There was no associated clinical deterioration or any adverse reactions attributable to vaccine. CONCLUSIONS: Rabies vaccination in HIV-1-infected children appears to be safe but did not significantly change the levels of plasma HIV RNA, CD4+ and CD8+ cell counts.

Animals↗
PubMed2001

Failure of pre- and postexposure rabies vaccinations in a child infected with HIV.

We report the case of a 6-y-old HIV-infected girl with severe immune deficiency who failed to respond to intramuscular pre-exposure rabies vaccination using human diploid cell rabies vaccine on days 0, 7 and 28. She also failed to respond to an intradermal postexposure rabies regimen using purified verocell rabies vaccine at 4 sites on days 0, 3 and 7 and at 2 sites on days 30 and 90 (double the usual regimen). Sequentially monitored rabies neutralizing antibody titers were below the WHO minimum acceptable level (> 0.15 IU/ml) in all specimens. Rabies prevention in HIV-infected persons with severe immune suppression requires further study.

Animals↗
PubMed2001

Rabies exposures in thai children.

OBJECTIVE: To determine the epidemiology of potential rabies exposures in Thai children. METHODS: The study was carried out at the Queen Saovabha Memorial Institute of the Thai Red Cross Society during I calendar year. All charts of victims aged 0 to 14 years with possible rabies exposures were retrospectively reviewed. RESULTS: Subjects were 2622 children, with a male to female ratio of 1.6:1 and a mean age of 6.7 years (range, 2 months to 14 years). Most exposures (86.3%) were related to dogs. The most common site of exposure was the lower extremity. The majority of exposures occurred in or around the home and as the consequence of unprovoked attacks rather than provoked attacks. Antirabies vaccines were given in all cases: 68.4% using the Thai Red Cross intradermal route, and 31.6% using the intramuscular route. Rabies immunoglobulin (RIG) was prescribed in 57.5% of children; 35.2% received human RIG (HRIG), and 22.3% received purified equine RIG (ERIG). CONCLUSIONS: This study confirms that rabies exposures, especially in children, are an important public health problem in Thailand. The reduced-dose, multiple-site intradermal rabies vaccine method and ERIG in place of HRIG reduce the cost of treatment.

Adolescent↗
PubMed2001

Short course zidovudine maternal treatment in HIV-1 vertical transmission: randomized controlled multicenter trial.

A multicenter randomized, double blind, placebo-controlled clinical trial was conducted to evaluate the effectiveness of a short course of oral zidovudine (ZDV) treatment in HIV-1 infected pregnant women, starting at 38 weeks of gestation plus ZDV infusion during labor until delivery, to reduce HIV-1 vertical transmission in non-breast fed infants. One hundred and eighty two asymptomatic antiretroviral naïve HIV-1 infected pregnant women were enrolled. Each patient was randomly allocated into either the ZDV or placebo group. The ZDV group received 250 mg ZDV orally twice a day initiated at 38 weeks' gestation until the onset of labor. During the intrapartum period, ZDV infusion at the rate of 2 mg/kg was administered within the first hour and then continuously infused at the rate of 1 mg/kg/h until delivery. The placebo group received an identical capsule during pregnancy and normal saline infusion during labor until delivery. HIV-1 transmission was documented by nested polymerase chain reaction in infants at birth and at 1, 3 and, 6 months of age. The estimated HIV-1 vertical transmission rate was 14.9 per cent (95% CI = 11.1 to 18.7) and 16.3 per cent (95% CI = 12.3 to 20.9) in ZDV and placebo group, respectively (p > 0.05). The short course ZDV in antiretroviral naïve pregnant women initiated at 38 weeks' gestation plus intrapartum ZDV infusion without treatment in the infants was not effective to prevent HIV-1 vertical transmission.

Adolescent↗
PubMed2001

Childhood cryptococcosis: an increasing problem in the era of AIDS.

The authors reported 8 children with cryptococcosis from King Chulalongkorn Memorial Hospital from 1991 to 2000. Five patients were older than five years. The two common underlying diseases were HIV/AIDS (5 cases) and systemic lupus erythematosus (2 cases). Seven cases had been observed in the past four years, four of these in 2000. One patient developed disseminated disease and two patients died. In the era of HIV/AIDS and due to the fact that HIV-infected children are tending to live longer, we may encounter a higher occurrence of this opportunistic fungus in children.

AIDS-Related Opportunistic Infections↗
PubMed2001

Seroprevalence of Epstein-Barr virus infection in Thai children.

A hospital-based cross-sectional survey was conducted in Bhumibol Adulyadej Hospital, Bangkok, Thailand between January and December 1997 to study the seroprevalence of anti-EBV IgG antibody in previously healthy hospitalized children aged 0-15 years. Of 589 cases, there were 327 boys and 262 girls with a mean age of 3.9 years. The seroprevalence of EBV infection was 50.4, 72.8, 92.3, 96.6 and 97.6 per cent in children at the age range of 0-2, 3-5, 6-8, 9-11 and 12-14 years, respectively. After excluding infants below 6 months of age, the total seroprevalence rate was 68.4 per cent. The age of children with positive anti-EBV IgG antibody was significantly higher than that of children with negative antibody. Children who were reared at home had lower seroprevalence rates. In conclusion, seroprevalence of EBV infection increased with advancing age and reached 90 per cent or more after 6 years of age.

Adolescent↗
PubMed2001

Neurological manifestations in dengue patients.

To determine the frequency and the natural history of neurological manifestations of dengue infection in Thai children, 1,493 children diagnosed with dengue infection by serology and admitted to the Department of Pediatrics, Chulalongkorn Hospital, Bangkok, Thailand from 1987 to 1998 were reviewed from prospectively recorded medical charts. There were 80 children identified with neurological manifestations, an incidence of 5.4% of all dengue patients. Of these, there were 41 males and 39 females, with ages ranging from 3 months to 14 years. They were categorized into 20 cases of dengue fever, 26 cases of dengue hemorrhagic fever and 34 cases of dengue shock syndrome. All cases experienced the neurological manifestations during the febrile stage of the illness. The patients were classified into an encephalitic group (called "dengue encephalopathy") (42), a seizure group (35) and a miscellaneous group (3). Encephalitic patients presented with alteration of consciousness (83.3%), seizure (45.2%), mental confusion (23.8%), nuchal rigidity (21.4%), spasticity of limbs (9.5%), positive clonus (4.8%), hemiplegia (2.4%) and positive kernig (2.4%), and were older than those in the other groups. Patients in the seizure group presented with seizure (100%) and positive clonus (2.9%). Abnormal laboratory findings included hyponatremia, abnormal liver enzymes and CSF pleocytosis. Dengue IgM and dengue PCR were not demonstrated in 16 CSF specimens. An autopsy finding of a child in the encephalitic group showed histologic evidence of encephalitis, the only case of confirmed dengue encephalitis in this study. One patient with encephalitic symptoms suffered from long-term neurological sequelae. The overall mortality rate was 5%. In conclusion, neurological manifestations including seizure and encephalopathy in children with dengue are not uncommon whereas dengue encephalitis is a rare entity.

Adolescent↗
PubMed2001

Intrapartum zidovudine infusion alone failed to reduce both maternal HIV-1 viral load and HIV-1 infection in infant.

A pilot clinical trial to assess the efficacy of intrapartum zidovudine (ZDV) infusion alone in the reduction of maternal viral load and its potential role in preventing vertical transmission of HIV-1. Twenty six, asymptomatic antiretroviral naïve HIV-1 infected pregnant women who had no prior antenatal care and were in labor were enrolled. Each patient received ZDV infusion at the rate of 2 mg/kg within the first hour. ZDV was then continuously infused at 1 mg/kg/h until delivery. Maternal plasma HIV-1 RNA prior to the commencement of ZDV infusion and within an hour after delivery were measured. HIV-1 transmission was documented by nested polymerase chain reaction in infants at six months of age. Median maternal plasma HIV-1 RNA prior to the ZDV infusion and after delivery was 29,401 and 32,555 copies/ml respectively, (p>0.05). The estimated HIV-1 transmission rate was 19.2 per cent (95% CI = 4-34). This result suggested that in asymptomatic HIV-1 infected pregnant women who were antiretroviral naïve and had no prior antenatal care, intrapartum ZDV infusion alone failed to reduce maternal HIV-1 viremia and the transmission rate of HIV-1.

Anti-HIV Agents↗
PubMed2001

Seroprevalence of Epstein-Barr virus antibody among children in various age groups in Bangkok, Thailand.

There are no current data on previous Epstein-Barr virus (EBV) infections in different age groups of Thai children. This study was conducted to determine the prevalence of anti-EBV IgG antibody in healthy children of various age ranges in Bangkok, Thailand. Between June and December 1998, blood samples were collected from 425 volunteers aged 6 months to 15 years who attended a well baby clinic in the northern suburban part of Bangkok, Thailand. Serum samples were assayed for specific anti-EBV IgG antibodies using a commercial enzyme-linked immunosorbent assay kit. The percentage of children with positive anti-EBV IgG antibody increased with advancing age. The overall seropositivity rate was 72.7%. Children with anti-EBV IgG antibody were significantly older than those without the antibody. Seronegative children were reared at home significantly more frequently than seropositive children. These seroopidemiologic data will guide calculation of the appropriate age for administration of an EBV vaccine to children, when it becomes available.

Adolescent↗
PubMed2001

Universal antenatal human immunodeficiency virus testing in Hong Kong: consensus statement.

Following the recommendations of the Advisory Council on AIDS, Hong Kong, the Hospital Authority announced plans to introduce universal antenatal screening for human immunodeficiency virus infection and hence, a consensus conference was held to discuss strategies for implementing such screening in Hong Kong. This paper reports the discussions of the consensus conference. The consensus meeting group consisted of 15 clinicians and scientists from Hong Kong, Macau, and Thailand. Seven commonly asked questions concerning mother-to-child transmission of human immunodeficiency virus were selected for discussion by the participating panellists. Information on the laboratory diagnosis of human immunodeficiency virus infection and the efficacy of preventive measures in reducing mother-to-child transmission of human immunodeficiency virus were reviewed. Data from local studies was also presented and discussed. The timing, potential problems, and cost issues involved in testing all pregnant women in Hong Kong for human immunodeficiency virus were then considered.

Adult↗
PubMed2001

Intrapartum and neonatal zidovudine treatment in reduction of perinatal HIV-1 transmission in Bangkok.

OBJECTIVE: To evaluate the efficacy of zidovudine (ZDV) administered during labor and to the infants in the first 6 weeks of life in reduction of perinatal HIV-1 transmission. DESIGN: Open label clinical trial. SITE: King Chulalongkorn Memorial Hospital, Bangkok, Thailand. MATERIAL AND METHOD: One hundred asymptomatic, antiretroviral naive HIV-1 infected pregnant women who had either late or no prenatal care were recruited from the obstetric service of King Chulalongkorn Memorial Hospital, Bangkok, Thailand. They were given ZDV 300 mg orally every 3 hours during the intrapartum period until delivery. ZDV syrup 2 mg/kg orally every 6 hours were given to the infants immediately after birth for 6 weeks. Breast feeding was not allowed. Infant's blood for HIV-1 PCR test was obtained at age 1 day, and 1, 3 and 6 months. HIV-antibody test was determined at age 18 months. Infants with at least one positive HIV-1 PCR test performed at or after 1 month of age or positive HIV-antibody test at age 18 months were classified as HIV-1 infected infants. RESULTS: There were 100 healthy infants delivered without complication. Fourteen infants were excluded due to; 13 lost to follow-up and 1 drug intolerance. Of the remaining 86 infants who were followed-up, 27 infants (31.4%) did not receive intrapartum ZDV treatment and 9 infants were HIV-1 infected. The perinatal transmission rate was 10.5 per cent, (95% CI 3.9, 17.1). CONCLUSION: The result of this study suggests that intrapartum oral ZDV treatment in asymptomatic HIV-1 infected mothers together with ZDV treatment in the neonates for 6 weeks can reduce the rate of perinatal HIV-1 transmission. This regimen may be an alternative treatment for prevention of HIV-1 infection in infants born to HIV-1 seropositive mothers who have had either late or no prenatal care.

Administration, Oral↗
PubMed2001

Invasive pneumococcal infection and drug-resistant Streptococcus pneumoniae in Thai children.

Sixty-eight children with systemic Streptococcus pneumoniae infection were identified by hospital chart review between 1986-1997. The age distribution varied from 2 days to 15 years, with a mean age of 3.3 years. There were 35 boys and 33 girls. Four clinical entities included 30 cases of meningitis, 20 cases of pneumonia, 10 cases of peritonitis and 8 cases of septicemia/bacteremia. Forty patients (58.8%) had underlying diseases. Seventeen patients (25.0%) developed early complications and the mortality rate was 8.8 per cent. The percentage of susceptible isolates to penicillin, chloramphenicol, cefotaxime/ceftriaxone, ciprofloxacin, imipenem and vancomycin were 69.6, 91.3, 100.0, 87.2, 100.0 and 97.1 per cent, respectively. There were six cases of drug-resistant S. pneumoniae (DRSP) infection; 3 cases of meningitis, one case of pneumonia, one case of infective endocarditis and one case of purpura fulminans. Our data indicate that S. pneumoniae infection is relatively serious and life-threatening. There is a trend of increasing prevalence of invasive pneumococcal and DRSP infections.

Adolescent↗
PubMed2001

Seroprevalence of hepatitis A virus antibody among children and young adults in Bangkok.

OBJECTIVE: To determine the prevalence of hepatitis A virus (HAV) antibodies in various age groups of healthy children and young adults who have not received the hepatitis A vaccine. METHOD: Blood samples were collected from 825 volunteers aged 1-30 years from a well baby clinic and five academic institutions in the Don Mueang area from 1998 to 1999. Serum samples were assayed for specific HAV IgG antibodies using a commercial enzyme-linked immunosorbent assay (ELISA) kit. RESULTS: The seropositivity rate (12.4% overall) in each age group was as follows: 1-3 years, 7.7 per cent; 4-7 years, 6.6 per cent; 8-11 years, 12.4 per cent; 12-15 years, 10.7 per cent and 16-30 years, 25.9 per cent. CONCLUSIONS: In the Don Mueang area of Bangkok, the majority of children (< 16 years) do not have natural immunity against HAV. The use of hepatitis A vaccine for this population should be considered. Pre-vaccination serologic screening for HAV IgG in children may not be worthwhile.

Adolescent↗
PubMed2001

Primary dengue infection: what are the clinical distinctions from secondary infection?

To determine the magnitude of the problem posed by primary dengue infection in children and the distinctive clinical clues that may differ from those with secondary infection, 996 children serologically diagnosed with dengue infection and admitted to the Department of Pediatrics, Chulalongkorn Hospital, Bangkok, Thailand between 1988 and 1995 were retrospectively reviewed. One hundred and thirty-nine cases (14.0%) were serologically proved to be primary dengue infection. Of these, 72 were males and 67 were females, with a mean age of 4.8 years. Common manifestations by order of frequency included fever (97.8%), hepatomegaly (71.9%), vomiting (59.0%), decreased appetite (55.4%), coryza (52.5%), drowsiness (39.6%), diarrhea (34.5%), rash (33.8%), abdominal pain (23.0%) and seizure (15.8%). The mean duration of fever before admission was 4.6 days. Common sites of bleeding were skin (41.7%), mucous membrane (14.4%) and the gastrointestinal tract (12.2%). Clinical diagnosis was categorized into dengue fever (22.3%), dengue hemorrhagic fever (60.4%) and dengue shock syndrome (17.3%). Three patients (2.2%) died. Compared with the children with secondary dengue infection (n=139), children with primary dengue infections tended to be younger, presented more commonly with coryza, diarrhea, rash and seizure; and less commonly with vomiting, headache and abdominal pain (p < 0.05). The maximal hematocrit level, the mean difference between maximal and minimal hematocrit values and the maximal percentage of neutrophils were significantly lower in the study group, whereas the maximal percentage of lymphocytes was significantly higher. Dengue fever was more common and dengue shock syndrome was less common in the study group (p < 0.05). This study has emphasized that primary dengue infection is not uncommon and is less severe than secondary infection. Clinical presentations and laboratory findings are somewhat different between the two conditions.

Adolescent↗
PubMed2001

Measles in Thai adults: three case reports and management of contact cases.

We report on three adults (one nurse and two medical students) diagnosed as having measles. All the patients presented with fever, cough, conjunctival injection and rash. They contracted measles from pediatric patients who had been treated at Chulalongkorn Hospital in the previous two weeks. Physical examination revealed Koplik's spots on the oral mucosa and typical maculopapular rash. The diagnosis was confirmed by viral isolation. Measles IgG antibodies were measured in 36 medical students who were in close contact with patient 2 and measles vaccines were given. Thirty-three specimens had positive measles IgG, two had equivocal results and one had negative result. The student with negative measles IgG eventually developed measles (patient 3). Except for patient 2 and 3, no further cases of measles were seen among the contacts.

Adult↗