Clinical, epidemiological, and spatial features of human rabies cases in Metro Manila, the Philippines from 2006 to 2015

PLoS Negl Trop Dis. 2022 Jul 19;16(7):e0010595. doi: 10.1371/journal.pntd.0010595. eCollection 2022 Jul.

Abstract

Rabies remains a public health problem in the Philippines despite the widespread provision of rabies vaccines and rabies immunoglobulin (RIG) as post-exposure prophylaxis (PEP). Detailed descriptions of recent human rabies cases in the Philippines are scarce. This study aimed to describe the clinical, epidemiological, and spatial features of human rabies cases between January 1, 2006, and December 31, 2015. We conducted a retrospective hospital-based case record review of all patients admitted to one referral hospital in Manila who received a clinical diagnosis of rabies. During the 10-year study period there were 575 patients (average 57.5 cases per year, range 57 to 119) with a final diagnosis of rabies. Most patients were male (n = 404, 70.3%) and aged ≥ 20 years (n = 433, 75.3%). Patients mostly came from the National Capital Region (n = 160, 28.0%) and the adjacent Regions III (n = 197, 34.4%) and IV-A (n = 168, 29.4%). Case mapping and heatmaps showed that human rabies cases were continuously observed in similar areas throughout the study period. Most patients had hydrophobia (n = 444, 95.5%) and/or aerophobia (n = 432, 93.3%). The leading causative animals were dogs (n = 421, 96.3%) and cats (n = 16, 3.7%). Among 437 patients with animal exposure history, only 42 (9.6%) had been administered at least one rabies vaccine. Two patients (0.5%), young children bitten on their face, had received and a full course of rabies vaccine. Human rabies patients were continuously admitted to the hospital, with no notable decline over the study period. The geographical area in which human rabies cases commonly occurred also did not change. Few patients received PEP and there were two suspected cases of PEP failure. The retrospective design of this study was a limitation; thus, prospective studies are required.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Bites and Stings* / drug therapy
  • Child
  • Child, Preschool
  • Dogs
  • Female
  • Humans
  • Male
  • Philippines / epidemiology
  • Phobic Disorders
  • Post-Exposure Prophylaxis
  • Rabies Vaccines*
  • Rabies* / drug therapy
  • Rabies* / epidemiology
  • Rabies* / prevention & control
  • Retrospective Studies

Substances

  • Rabies Vaccines

Supplementary concepts

  • Aerophobia

Grants and funding

The work was mainly supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Government of Japan to CMP. This work was also partially supported by a JICA/AMED SATREPS (Science and Technology Research Partnership for Sustainable Development)(https://www.jst.go.jp/global/english/ index.html) for “The establishment of the one health prevention and treatment network model for the elimination of rabies in the Philippines” (No.17823721) to AN. The funders had no role in the study design, data collection and analysis, decision to publish or reparation of the manuscript.