U.S. and Canadian health officials caution against
eating Roman lettuce from the Salinas area in California, USA.
Food supermarkets and restaurants
also need to check their inventory and do not sell or use
or to make salad out of Roman lettuce from the area.
The recent outbreak of E. coli
caused by romaine lettuce in the United States.
The US Centers for Disease Control
and Prevention (CDC) said that so far,
在美国的 16 个州出现了40 个病例
40 cases have occurred in 16 states in the United States.
这次疫情始于 11 月10 日
The outbreak began on November 10.
A case related to the U.S. outbreak has also occurred in Canada,
with the patient in Manitoba.
The Public Health Agency of Canada
（Public Health Agency of Canada ）上周五表示
said on Friday that
Canadian and US health officials are working together
to pinpoint the source of the pollution.
The Department of Public Health also said that
measures have been taken to protect consumers
and that new measures are being taken at the border
to ensure that problematic Roma lettuce is not shipped into Canada.
In the past two years, outbreaks caused by Roma lettuce
have continued to occur in North America.
2018 年春季的一次疫情爆发使 200 多人患病
An outbreak in the spring of 2018
并导致 5 人丧生
left more than 200 people sick and killed 5 people.