[Outbreak of follicular conjunctivitis caused by adenovirus in a geriatric centre].

INTRODUCTION

Adenovirus serotype 4a is a respiratory virus that occasionally causes conjunctivitis. This paper describes an outbreak of follicular conjunctivitis that occurred in a geriatric centre.

MATERIAL AND METHODS

Outbreak description and epidemiological research through a survey. For the microbiological study conjunctival swabs were collected using viral and bacterial transport media. Adenovirus was detected by real-time polymerase chain reaction. The serotype was determined by sequencing of a fragment of the hexon and E1 genes.

RESULTS

In autumn 2008 an outbreak of follicular conjunctivitis caused by adenovirus serotype 4a was detected. Twenty three percent 23% (69/300) of residents and 5% (9/180) of workers in a geriatric centre in Gipuzkoa were affected. The clinical symptoms were of prolonged duration (11±5 days). The temporal association of the cases suggested transmission from person to person. The sanitary measures established (asepsis and frequent hand washing, cleaning and disinfection of objects and surfaces) were effective, interrupting the transmission of the disease within a short period of time.

CONCLUSION

Rapid detection, identification of the causative agent and implementing appropriate control measures can significantly reduce the impact on both health and economic costs of these outbreaks.