) report states there have been 15 deaths between September 12 and November 28 - six more than were previously announced.
Seven cases had previously been identified in England.
One had been reported in Belfast, Northern Ireland, the death of Stella-Lily McCorkindale , plus one in Wales, with the death of Hanna Roap - having bought the total in the UK to nine.
The new report totals 15 and does not state where each death has occurred and where cases have been detected.
Speaking of the shortage of antibiotics, Mr Webb said: "Local pharmacy teams may be experiencing a temporary interruption of supply of some relevant antibiotics due to increased demand."
But, he said that "sufficient stock exists for the NHS" on a national level.
His warning comes after pharmacies had also raised concerns around antibiotic stock levels .
Group A Streptococcus — Streptococcus pyogenes — is a bacteria that can cause mild illness.
This can include sore throats and skin infections, alongside tonsillitis, cellulitis, and scarlet fever , which is flu-like and tends to occur in children - it can be serious if not treated swiftly with antibiotics.
The UKHSA report states that there have been 6,601 notifications of scarlet fever. This compares to a total of 2,538 at the same point in the last comparably high season in 2017/2018.
In rare cases, the bacteria can trigger invasive Group Strep A disease, which can prove life-threatening and even fatal.
UKHSA said that in the 2017/18 season, which is deemed to be the last high Strep A season, there were 355 deaths in total, including that of 27 children.
There have been 169 kids that have also contracted invasive Group Strep A (iGAS) this season, this compares to 431 that developed it in 2017/18.
And there were 851 cases OF Group A streptococci in the week to November 20, compared to 186 on average in the same week in previous years.
While most cases are mild, the bacteria can sometimes get into the bloodstream and cause Group A strep.
There has been an increase in cases this year, particularly in children under the age of 10.
There have been 2.3 iGAS cases for every 100,000 children aged between one and four years old, compared to 0.5 per 100,000 before the pandemic.
The symptoms of Strep A and scarlet fever you need to know There are four key signs of Group Strep A to watch out for, according to the NHS. These are:
A fever (meaning a high temperature above 38°C) Severe muscle aches Localised muscle tenderness Redness at the site of a wound The NHS says that when it comes to scarlet fever, your child will most likely start off with cold-like symptoms.
The signs will include:
high temperature sore throat swollen neck glands rash 12-48 hours after initial symptoms. This usually starts on the tummy and then spreads white coating on the tongue red cheeks Medics said cases of the illness have been 'particularly high compared to levels reported in the last peak season preceding the Covid-19 pandemic – and substantially higher than the past two years'.
Cases of Strep A have risen across the UK, so too have more serious cases of both scarlet fever and invasive Group A Strep disease .
The report stated that so far this season, since September 12, there have been 60 deaths across all age groups with invasive Strep.
This includes 13 children under the age of 18.
Further data also shows there have been 85 iGAS cases in kids aged one to four, this compared to 194 in the last high season.
In kids aged five to nine, there have been 60 cases, compared to 117 in the last high season.
UKHSA added that there is no evidence to suggest there is a new strain circulating, or that there has been any increase in antibiotics resistance.
Medics said that seasons with very high cases occur every three to four years.
"But social distancing measures implemented during the Covid-19 pandemic may have interrupted this cycle and explain the current increase being observed," the report stated.
Dr Colin Brown, Deputy Director, UKHSA said both scarlet fever and Strep throat are common childhood illnesses that can be treated with antibiotics.
He urged parents to contact 111 or their GP if your child is struggling with symptoms.
'NO CAUSE FOR ALARM' "Very rarely, the bacteria can get into the bloodstream and cause more serious illness called invasive Group A strep.
"We know that this is concerning for parents, but I want to stress that while we are seeing an increase in cases in children, this remains very uncommon.
"There a lots of winter bugs circulating that can make your child feel unwell, that mostly aren’t cause for alarm.
"However, make sure you talk to a health professional if your child is getting worse after a bout of scarlet fever, a sore throat or respiratory infection – look out for signs such as a fever that won’t go down, dehydration, extreme tiredness and difficulty breathing," he added.
Parents have been warning others of the signs of the illness, as children have been battling the bug.
Mum Jenna Higham said her little boy George's screams will 'haunt her forever' after he was found to have Strep A.
Seven-year-old Hanna Roap is among those youngsters who have lost their lives.
What started as a mild cough rapidly deteriorated and she tragically died within 24-hours.
Meanwhile, another dad told how he took his five-year-old Stella-Lily McCorkindale to A&E three times before she died of Strep A.
And another mum has shared photos of her little boy to highlight how fast Strep A strikes after her little one was diagnosed with the illness, as well as scarlet fever and pneumonia.
One other youngster, five-year-old Eva, is currently fighting for her life on a ventilator after being struck down with Strep A.
Her mum is now warning other parents to keep an eye out for the signs of the illness.