Barnet and Hackney, the London boroughs with the largest Jewish populations, recorded the highest rises in coronavirus cases in the capital for last week.
The data from Public Health England does not give any ethnic or religious breakdown of cases.
But last week Barnet Council issued an alert over a “small increase” in cases in the Golders Green area, with anecdotal evidence suggesting a rise within the Orthodox community.
Hackney Council reported two clusters of cases in Stamford Hill last week.
There were 41 new cases in Hackney and the City of London last week – 24 more than the previous week.
The 25 new cases in Barnet were 12 more than the week before.
In 17 of the 32 London boroughs, new cases were lower than the previous week’s number.
Newham’s 22 cases were 11 more than in the previous week, but in another eight boroughs where there had been a rise, it was five or less.
In three boroughs, the number was the same as the week before.
The difference in new cases could reflect the level of testing rather than incidence of the disease.
Meanwhile, the Board of Deputies reported that UK Jewish deaths from coronavirus had risen to 506 by last Friday, up two from the previous week.
The UK death toll from the disease stands at 45,422, according to government figures based on positive tests for coronavirus.
But data from the Office for National Statistics, which counts cases where coronavirus has been registered as a cause of death, puts the number above 55,000.
On Wednesday, Hackney council tweeted a video message from the Jewish emergency medical service Hatzola advising anyone showing symptoms of the virus to get a test.
A mobile test unit will be in Stamford Hill this Sunday and the following Sunday.
Watch this important message from @Hatzola and help keep Stamford Hill safe from coronavirus.— Hackney Council (@hackneycouncil) July 22, 2020
If you have symptoms of the virus such as a fever or cough then book a test straight away by visiting https://t.co/tt8dyE1oz9 calling 119 or 18001 119 if you have hearing difficulties. pic.twitter.com/d2mPzQBxaT