Adolescent ; Adult ; Anti-HIV Agents ; adverse effects ; Child ; Guideline Adherence ; HIV Infections ; drug therapy ; Humans ; Medical Audit ; Middle Aged ; Practice Guidelines as Topic ; Retrospective Studies ; Safety-Based Drug Withdrawals ; Singapore ; Stavudine ; adverse effects ; World Health Organization ; Young Adult

Disease Outbreaks ; prevention & control ; statistics & numerical data ; Humans ; Severe Acute Respiratory Syndrome ; epidemiology ; Singapore ; epidemiology

Anniversaries and Special Events ; Asia, Southeastern ; Biomedical Research ; Dengue ; Humans ; Singapore

Disease Outbreaks ; Humans ; Influenza A Virus, H1N1 Subtype ; Influenza, Human ; epidemiology ; Singapore ; epidemiology ; World Health Organization

Adult ; Antibodies, Viral ; blood ; Follow-Up Studies ; Hantaan virus ; isolation & purification ; Hemorrhagic Fever with Renal Syndrome ; diagnosis ; Humans ; Immunoglobulin G ; blood ; Immunoglobulin M ; blood ; Male ; Singapore ; Travel

Adult ; Comorbidity ; Humans ; Influenza A Virus, H1N1 Subtype ; isolation & purification ; Influenza, Human ; diagnosis ; drug therapy ; physiopathology ; Inpatients ; Male ; Pneumococcal Infections ; diagnosis ; drug therapy ; physiopathology ; Streptococcus pneumoniae ; isolation & purification ; Treatment Outcome

INTRODUCTIONThe incidence of newly diagnosed older patients diagnosed with human immunodeficiency virus (HIV) has increased worldwide in recent years. In this study, we compared the demographics and clinical presentation of younger and older patients in our HIV sentinel cohort.

MATERIALS AND METHODSAmong all HIV patients presenting to the Communicable Disease Centre (CDC), Singapore from 2006 to 2011, 793 were randomly included in our cohort, representing about 50% of the patients seen during that period. We collected demographic, clinical, laboratory, and outcome data from patient records to compare younger (<50 years old) and older (≥50 years old) HIV patients.

RESULTSOlder patients comprised 27.1% of our HIV cohort and presented with lower median CD4 T cell counts (65 cells/mm³, interquartile range [IQR]: 27 to 214 cells/mm³) compared to younger patients (250 cells/mm³, IQR: 74 to 400 cells/mm³; P <0.001). The median time from HIV diagnosis to initiation of antiretroviral therapy (ART) differed significantly for both age groups as well (49 days for patients <50 years old, IQR: 18 to 294 days; versus 35 days for patients ≥50 years old, IQR: 14 to 102 days; P = 0.008). More of our younger patients were single (72.2%) or homosexual (44.1%), in contrast to older patients, of whom 48.8% were married and 84.7% were heterosexual.

CONCLUSIONUpon comparison of our younger and older patients, we identified distinct differences in risk transmission and clinical presentation. Increased awareness of older patients at risk of HIV may improve time to diagnosis among this age group.

Age Factors ; Anti-Retroviral Agents ; therapeutic use ; CD4 Lymphocyte Count ; statistics & numerical data ; Female ; HIV Seropositivity ; drug therapy ; epidemiology ; physiopathology ; Humans ; Male ; Medical Audit ; Middle Aged ; Retrospective Studies ; Singapore ; epidemiology

INTRODUCTIONHighly active antiretroviral therapy (HAART) has greatly changed the epidemiology of human immunodefi ciency virus (HIV) mortality. The aim of this study is to compare the causes of death and factors associated with early death in HIV-infected persons in the pre- and peri-highly active antiretroviral therapy (HAART) periods.

MATERIALS AND METHODSWe conducted a retrospective review of 483 HIV-infected persons who were diagnosed with HIV from 1985 to 2000, and had died within 5 years of the diagnosis. We examined the temporal change in the primary causes of death between those who were diagnosed in the pre-HAART (1985 to 1995) and peri-HAART (1996 to 2000) periods, and compared the demographic and clinical characteristics of the 2 groups.

RESULTSDuring the peri-HAART period, HIV encephalopathy, cryptococcal meningitis, and lymphoma were no longer the leading causes of death. Opportunistic infections remained important causes of death. Early deaths from the peri-HAART period were older (60 years and above) at diagnosis (Adj OR 7.50; 95% CI, 1.78 to 31.58), more likely to be divorced (Adj OR 5.05, 95% CI, 1.96 to 13.02) and tended to have a low baseline CD4 cell count of <50 cells/ uL (Adj OR 2.18, 95% CI, 1.14 to 4.16) , and were more likely to have received HAART (Adj OR 5.19; 95% CI, 2.22 to 12.12) than early deaths from the pre-HAART period.

CONCLUSIONIn the peri-HAART era, HIV-infected persons who died within 5 years of diagnosis were those who were older (≥60 years), divorced, or who presented with very late-stage disease (CD4 <50) at diagnosis. More targeted public health interventions, such as targeted public health messages and outreach to increase access to HIV testing and treatment should be developed for these subpopulations.

AIDS-Related Opportunistic Infections ; mortality ; Adult ; Anti-Retroviral Agents ; therapeutic use ; Antiretroviral Therapy, Highly Active ; CD4 Lymphocyte Count ; Cause of Death ; trends ; Confidence Intervals ; Female ; HIV Seropositivity ; drug therapy ; immunology ; mortality ; HIV-1 ; drug effects ; immunology ; Humans ; Male ; Medical Audit ; Middle Aged ; Mortality, Premature ; trends ; Odds Ratio ; Retrospective Studies ; Singapore ; epidemiology

INTRODUCTIONIt has been noted that SARS transmission is characterised by a few super-spreading events (SSEs) giving rise to a disproportionate number of secondary cases. Clinical and environmental features surrounding the index cases involved were compared with cases in non- SSEs.

MATERIALS AND METHODSData on 231 cases of probable SARS admitted to Tan Tock Seng Hospital (TTSH) were used. Index cases directly causing 10 or more secondary cases were classified as having been involved in SSEs; all others were defined as non-SSEs.

RESULTSOnly 5 cases were involved in SSEs; all 5 were isolated on day 5 of illness or later, and spent at least a brief period in a non-isolation ward; in contrast, amongst the 226 non-SSE cases, only 40.7% and 4.0% were isolated late and admitted to non-isolation wards respectively, and only 3.1% had both these environmental features present; the differences were highly significant (P = 0.012, P <0.001 and P <0.001 by Fisher's Exact test). When compared to 7 non-SSE cases with delayed isolation and an admission to non-isolation wards, SSEs were more likely to have co-morbid disease or require ICU care at time of isolation (P = 0.045 for both factors).

CONCLUSIONSSEs were likely due to a conglomeration of environmental factors of delayed isolation and admission to a non-isolation ward, coupled with severe disease stage at time of isolation.

Adult ; Female ; Humans ; Male ; Middle Aged ; Severe Acute Respiratory Syndrome ; epidemiology ; transmission ; Singapore ; epidemiology

INTRODUCTIONThe outbreak of severe acute respiratory syndrome (SARS) began after the index case was admitted on 1 March 2003. We profile the cases suspected to have acquired the infection in Tan Tock Seng Hospital (TTSH), focussing on major transmission foci, and also describe and discuss the impact of our outbreak control measures.

MATERIALS AND METHODSUsing the World Health Organization (WHO) case definitions for probable SARS adapted to the local context, we studied all cases documented to have passed through TTSH less than 10 days prior to the onset of fever. Key data were collected in liaison with clinicians and through a team of onsite epidemiologists.

RESULTSThere were 105 secondary cases in TTSH. Healthcare staff (57.1%) formed the majority, followed by visitors (30.5%) and inpatients (12.4%). The earliest case had onset of fever on 4 March 2003, and the last case, on 5 April 2003. Eighty-nine per cent had exposures to 7 wards which had cases of SARS that were not isolated on admission. In 3 of these wards, major outbreaks resulted, each with more than 20 secondary cases. Attack rates amongst ward-based staff ranged from 0% to 32.5%. Of 13 inpatients infected, only 4 (30.8%) had been in the same room or cubicle as the index case for the ward.

CONCLUSIONSThe outbreak of SARS at TTSH showed the challenges of dealing with an emerging infectious disease with efficient nosocomial spread. Super-spreading events and initial delays in outbreak response led to widespread dissemination of the outbreak to multiple wards.

Adolescent ; Adult ; Aged ; Aged, 80 and over ; Cross Infection ; epidemiology ; prevention & control ; Disease Outbreaks ; Female ; Follow-Up Studies ; Humans ; Male ; Middle Aged ; Patient Isolation ; methods ; Retrospective Studies ; Severe Acute Respiratory Syndrome ; epidemiology ; prevention & control ; Singapore ; epidemiology