The Centers for Disease Control and Prevention appears to have stopped disclosing the number of Americans tested for coronavirus as the death toll in the US hits six.

Images posted online show a table published on the CDC's website had, as of Sunday night, a row showing the number of people screened.

By Monday that information was no longer available as the number of confirmed cases across the US reached 100, and the number of people with coronavirus to have died rose to six.

It comes as a staff physician at the New York-Presbyterian Hospital slammed a lack of checks as a 'national scandal'. DailyMail.com has contacted the CDC for comment.

Microbiologist Xiugen Zhang runs a Polymerase Chain Reaction (PCR) test at the Connecticut State Public Health Laboratory. The Connecticut Department of Public Health has received federal approval from the CDC to run diagnostic testing for the coronavirus

Images posted online show a table published on the CDC's website had, as of Sunday night, a column showing the number of people screened

By Monday that information was no longer available as the number of confirmed cases across the US reached 91

Dr Matt McCarthy said he doesn't have the tools to properly care for patients because of the lack of coronavirus tests being made available to hospitals.

He told CNBC's Squawk Box on Monday that the bungled test distribution was a 'national scandal' and claimed New York had only been able to properly carry out 32 tests so far.

'We hear it's coming very soon but I'm here to tell you that at one of the busiest hospitals in the country, I don't have it at my finger tips. I still have to call the department of health, I still have to make my case and plead to test people,' he said.

'This is not good. We know that there are (91) cases in the United States. There are going to hundreds by middle week, there's going to be thousands by next week. This is a testing issue.'

Dr McCarthy said the infectious disease team at his hospital, one of the busiest in the country, was equipped to deal with the outbreak but were crippled by the lack of diagnostic tests being made available by the government.

'Keep in mind in New York state the person who tested positive is only the 32nd test we've done in this state. That is a national scandal,' he said. 'They're testing 10,000 a day in some countries and we can't get this off the ground.

'I'm a practitioner on the firing line and I don't have the tools to properly care for patients today.'

Scott Gottlieb, who is the former commissioner of the Food and Drug Administration, also told CNBC that three critical weeks were lost in trying to contain the spread of coronavirus in the U.S. because of the faulty tests.

'We lost about three critical weeks,' he said.

Dr Matt McCarthy, right and Scott Gottlieb, right. Dr McCarthy said he doesn't have the tools to properly care for patients because of the lack of coronavirus tests being made available

Dr McCarthy said the infectious disease team at his hospital were crippled by the lack of diagnostic tests being made available by the government

Health officials announced on Monday that four additional people had died in Washington state. Two other patients in that same area died over the weekend.

News of the additional deaths came after Dr Anthony Fauci, the head of the National Institute of Allergy and Infectious Diseases, told NBC News on Monday that the disease had now reached 'outbreak proportions'.

The weeks-long struggle to expand local testing has been criticized as an early misstep in the response by President Donald Trump's administration to the outbreak.

The U.S. Department of Health and Human Services confirmed on Sunday that it is investigating a manufacturing defect in some initial coronavirus test kits that prompted some states to seek emergency approval to use their own test kits.

Three weeks ago, the FDA gave the green light for state and local labs to start using a testing kit developed by the CDC. But most labs that received the kits complained they had faulty components and produced inconclusive results, which the CDC later acknowledged.

In New York City, the kit they received was even more faulty than most, meaning city officials could not use a workaround released by the CDC this week. Meanwhile, it has had to courier samples to CDC's laboratories in Atlanta, adding a day or more to the process.

A woman wears a face mask as she waits on the subway after the first confirmed case of coronavirus was annoucned in New York