Cameron Lindsay - the Co Antrim teenager with a rare, life-threatening neurological brain condition - will be heading back to the United States early next month for further tests.
At the weekend an open garden event in Newtownabbey/Templepatrick raised over £1,300 for the Cameron Lindsay Appeal.
Natasha Lindsay, Cameron's mum, said she has been overwhelmed by the support since the campaign was launched.
Cameron has a condition abbreviated as PANDAS which stands for: Pediatric Autoimmune Neuropsychiatric Disorders Associated with Streptococcal infections (PANDAS)
"The only reason we will be back on that plane in two weeks time is because of the phenomenal generosity of people. It really is deeply humbling. We are so grateful and can't thank everybody enough. The response has been totally overwhelming," she said.
Cameron and his parents were with experts in New Jersey a few weeks ago. The cost of those initial tests was $12,000 dollars - and that's before flights and accommodation costs.
Natasha explained: "When we go back we get the results of the initial tests and a treatment plan will be put into place. We'll just have to see what happens at that stage and take things from there."
South Antrim MP Danny Kinahan was among those to support the open gardens event at the weekend.
"I'm just pleased to be at one or two of the garden openings to help raise the profile and ask everyone to give to Cameron's PANDAS campaign - and maybe then we have a chance of curing him," he said.
Victor McCabe and his next-door neighbour Teresa Murray - who live in Church Road, Glengormley - took part in the open gardens fund-raiser for the appeal.
Victor helped Teresa raise funds for the Hope House cancer charity last year - and this year she reciprocated when he asked her to help him support Cameron's appeal.
Teresa said: "I have been through some tough times. But when I'm at a low ebb I just go straight into the garden. It helps me relax. You just forget about all the nonsense that goes on because none of it is really that important."
For more details go to The Cameron Lindsay Appeal