The A&E doctor is currently working at University Hospital, Lewisham during the ongoing pandemic.
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Taking to Instagram Alex, 28, gave followers an insight into everyday working life as he posed in his scrubs, a protective face mask and a cap.
Alongside the photo, he wrote: "Covid-19 WILL NOT win. The NHS is SO resilient and we can and WILL do this.
"An update from the frontline, as well as the latest information on when widespread testing likely to occur, is live on my YouTube channel. Link is in bio."
Fans were quick to comment their support, with one writing: "Thank you for everything you are doing for us Dr Alex and everyone at the NHS, can’t be grateful enough."
Another said: "Keep safe, your all doing a wonderful job."
A third added: "We can do this all the nhs staff as got my support well done guys."
Last week, the former villa star admitted to feeling lonely while living separately from girlfriend Amelia Bath.
The couple are currently living apart after Amelia returned to her parents' home in Dorset.
He told fans on Instagram: "A lot of you might have realised I am living by myself during this period going from A&E to home and keeping away from everyone, as I don’t want to give Amelia an illness."
The medic star added: "In the NHS or any other health care system around the world, I know a lot of us like myself are isolating alone and I know that can be not ideal, and lonely even.
"But we’re in it so together and I just wanted to say to anyone that feels that way, you are not alone."
Alex, who is originally from Carmarthen, Wales, studied medicine at Exeter University and is currently working in South East London.
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He was able to do Love Island as he was on a zero hours contract at the hospital and he then returned following his stint on the show.
The star recently begged Good Morning Britain viewers to stop going to "pubs, clubs and bars" amid the coronavirus pandemic.
The UK coronavirus death toll has since risen to 1,228 after 209 more deaths were announced yesterday, with more than 19,522 Brits testing positive for Covid-19.
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