Wai Hong Phoon

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  • W H Phoon, K T Goh, L T Lee, K T Tan, S F Kwok
  • The Medical journal of Malaysia
  • 1983
Two outbreaks involving 31 persons with jaundice are described. All had originally been diagnosed as having viral hepatitis. But subsequent muestigations showed that all had been exposed to chloroform at work. Toxic jaundice from chemical exposure presents a similar clinical picture to that of viral hepatitis, but fever appears to be uncommon. Doctors who(More)
Tinnitus is said to be a common complaint of workers who are exposed to noise. We studied the prevalence and characteristics of tinnitus in 647 noise-exposed workers who had been notified as cases of noise-induced deafness. One hundred and fifty-one had tinnitus, giving a prevalence of 23.3 per cent. The tinnitus was bilateral in 42.4 per cent of cases, and(More)
OBJECTIVES To investigate the risk factors predicting radiological progression in silicosis in a prospective cohort study of patients with silicosis who were previously exposed to silica from granite dust. METHODS From among a total of 260 patients with silicosis contracted from granite work, 141 with available serial chest x ray films of acceptable(More)
Reports on cases of Stevens-Johnson syndrome (erythema multiforme major) have seldom related it to occupational exposure to chemicals. Serious liver involvement is also uncommon. This report describes 5 cases of the syndrome who had been occupationally exposed to trichloroethylene. The circumstantial evidence suggested that the chemical might have been a(More)
  • S F Ho, H P Lee, W H Phoon
  • British journal of industrial medicine
  • 1987
Malignant mesothelioma is a rare tumour strongly associated with asbestos exposure.' It is a notifiable disease in Singapore-voluntarily to the Cancer Registry since 1968 and statutorily under the Factories Act, 1973. Singapore's industrial exposure to asbestos started in the late 1940s with the establishment of a factory engaged in manufacturing asbestos(More)
The extent of occupational exposure to inorganic lead, manganese, arsenic and inorganic mercury in Singapore was determined from the results of Statutory Medical Examinations and environmental monitoring carried out by the Department of Industrial Health in 1989. There were 786 workers exposed to lead. Of these, 7.8 per cent had blood levels greater than 40(More)
This study focuses on the antiviral activity of selected flavonoids against the Chikungunya virus (CHIKV), a mosquito-transmitted virus that can cause incapacitating arthritis in infected individuals. Based on the results of screening on Vero cells, the tested compounds were evaluated further with various assays, including cytotoxicity assay, virus yield(More)
Thirteen workers with persistent abnormalities in one or more liver function tests (LFT) at a vinyl chloride monomer (VCM) polymerization plant were investigated. Twelve workers were found to have VCM-induced liver dysfunction based on circumstantial evidence. They were employed between 1971 and 1982 when the VCM levels ranged from 1 to 21 p.p.m. After 1982(More)
OBJECTIVE To carry out a comprehensive field investigation to evaluate various conventional and recently developed biomarkers for exposure to low concentrations of benzene. METHODS Analyses were carried out on environmental air, unmetabolised benzene in blood and urine, urinary trans, transmuconic acid, and three major phenolic metabolites of benzene:(More)