Poisons centre will monitor cases

doi:10.1136/bmj.311.7009.871a

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Henrietta Wheeler,
Virginia Murray

Information scientist Consultant occupational and environmental toxicologist National Poisons Information Service (London), London SE14 5ER

EDITOR,--Jean-Paul Yih's concern about the identification and management of injuries to the eye caused by O-chlorobenzylidine malononitrile (CS) gas1 is reflected by the number of inquiries about such injuries received by the National Poisons Information Service (London). In 1994, 354 emergency inquiries about CS gas were received from health care professionals throughout Britain.

In some circumstances differential diagnosis of the chemical is easy, but a recent inquiry to the service concerned an incident in …