A probe into the cause of several cases of suspected botulism in the North East remains ongoing.
A warning was issued earlier this month over alarming reactions to cosmetic procedures involving botulinum toxin.
Symptoms included severe eyelid drooping, double vision, difficulty swallowing, slurred speech and extreme lethargy, with a total of 28 people so far raising the alarm.
The UK Health Security Agency (UKHSA) confirmed that investigations remain ongoing - but evidence so far does not suggest that the product used has been contaminated.
The recent cases emerged following an alert by UKHSA on June 13, when clinicians were told to remain aware of botulism, a rare but serious condition in anyone who has recently had a cosmetic procedure involving botulinum toxin.
Symptoms are being reported from a few days up to four weeks after injection.
Dr Simon Howard, consultant in health protection from UKHSA said: "Our investigations into the cause of the issue continue.
“The practitioners associated with most of the reported cases are no longer carrying out these procedures.
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“However, that does not mean that we may not see more cases as symptoms can take up to four weeks to develop although we are now seeing the number of cases coming forward decreasing which is encouraging news.
“We will continue to work with our partners to reduce the public health risk and would advise people to make sure they take precautions when seeking aesthetic procedures.
“Anyone who has recently undertaken an aesthetic procedure, and is experiencing any of the symptoms listed, should contact NHS 111.”
Allergan Aesthetics the manufacturer of Botox, which contains a form of botulinum toxin, said there is no evidence as to which product was used in the procedures and suspects it is a counterfeit product.
A spokesperson from Allergan Aesthetics said: "Allergan Aesthetics is aware of recent reports of suspected botulism in patients in County Durham & Darlington, UK who received injections of a product, being referred to as ‘botox’.
"Investigations are ongoing, and Allergan Aesthetics is working with the local authorities.
"Allergan Aesthetics suspect that the product administered is counterfeit, further underpinning the importance of ensuring you are acquiring a genuine product through reputable and trusted channels.
"Allergan Aesthetics’ priority is the health and safety of patients and all reports of counterfeit product are thoroughly investigated by our team and in conjunction with law enforcement and regulatory authorities."
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