Real-time genomic investigation underlying the public health response to a Shiga toxin-producing Escherichia coli O26:H11 outbreak in a nursery.

Shiga toxin-producing Escherichia coli (STEC) is a significant cause of gastrointestinal infection and the haemolytic-uremic syndrome (HUS). STEC outbreaks are commonly associated with food but animal contact is increasingly being implicated in its transmission. We report an outbreak of STEC affecting young infants at a nursery in a rural community (three HUS cases, one definite case, one probable case, three possible cases and five carriers, based on the combination of clinical, epidemiological and laboratory data) identified using culture-based and molecular techniques. The investigation identified repeated animal contact (animal farming and petting) as a likely source of STEC introduction followed by horizontal transmission. Whole genome sequencing (WGS) was used for real-time investigation of the incident and revealed a unique strain of STEC O26:H11 carrying stx2a and intimin. Following a public health intervention, no additional cases have occurred. This is the first STEC outbreak reported from Israel. WGS proved as a useful tool for rapid laboratory characterization and typing of the outbreak strain and informed the public health response at an early stage of this unusual outbreak.

Reduction of vaccine-preventable communicable diseases in a Bedouin population: summary of a community-based intervention programme.

BACKGROUND: The Bedouin Arab population of southern Israel is in transition from a semi-nomadic lifestyle to permanent settlement, with many characteristics of a third-world population. A major outbreak of measles in the winter of 1990-91, with an incidence of 415.6 per 100,000 and a case fatality rate of 2.2 % among the Bedouin, led to the establishment of a national committee, which recommended an intervention programme. We report on the effect of the programme implementation on the reduction of vaccine-preventable communicable diseases in a Bedouin Arab population. METHODS: We compared immunisation coverage and incidence of reportable vaccine-preventable communicable diseases before and after implementation of the intervention programme. FINDINGS: Implementation of the intervention programme was associated with a marked increase in immunisation coverage, from 53% for first measles immunisation among those born in 1988, and reaching 2 years of age in 1990 at the start of the outbreak, to 90% at age 2 years among those born in 2001. We noted a decrease in all vaccine-preventable communicable diseases, except for pertussis, during this period. INTERPRETATION: The implementation of a targeted programme to improve immunisation coverage, and other concomitant changes in health-care delivery, was temporally associated with reduction of vaccine-preventable communicable diseases in a population of Bedouin Arabs in Israel who are living in semi-nomadic conditions. The success of the programme could be applicable to semi-nomadic populations living in other areas of the middle east.