(CNN) The coronavirus outbreak killed a New York Police Department custodian and is thinning the ranks of the police force in New York City, where at least 11% of the NYPD's workforce had called out sick on Friday, officials told CNN.

A senior NYPD official told CNN that 512 NYPD employees had tested positive for coronavirus as of Friday morning, up 161 since Thursday evening. Of them, 442 are uniformed members and 70 are civilian members.

The official said 4,122 employees were out sick on Friday.

Earlier in the week the NYPD issued a statement saying it anticipated an increase in the number of sick employees "and given the nature of the virus, it is expected that this number will grow." The statement went on to assure the public that the absences have had minimal impact on the NYPD's ability to keep the people of New York City safe.

On Thursday, NYPD Commissioner Dermot Shea announced that custodial assistant Dennis Dickson "who faithfully served with the NYPD since 2006" and worked in police headquarters, died from coronavirus complications. Shea said Dickson "worked 17 days straight" during superstorm Sandy.

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