as an unexpected or unusual sound which can be heard in your heart through a stethoscope.
The seven-year-old's body began swelling as it tried to heal, but his condition slowly improved.
Jessica said her son was discharged from hospital and made it home on Christmas Day.
However, she said Logan is "on a mountain of drugs" and has several doctor appointments in the coming weeks.
The mum said: "It will take a long time to fully recover - everyone needs to be taking this pandemic seriously and have awareness of the conditions it can lead to."
Another family went through a similar ordeal when their five-year-old daughter fell ill just weeks after beating Covid-19.
Piers Roberts said little Scarlett was fit and well" six weeks before she suddenly suffered multi-organ failure.
Her aunt, June, also shared the heartbreaking picture of the five-year-old hooked up to a ventilator.
She wrote on Twitter: "This is my five-year-old great niece. She was fit and healthy until a mild bout of Covid-19 five weeks ago from which she appeared to recover.
"She is now in ICU with a Kawasaki inflammatory response.
"She is off the ventilator but has developed heart problems."
WHAT IS PIMS-TS?
- PIMS-TS was first reported in April, after young patients needed intensive care following serious inflammation of the body.
- Inflammation is a normal response of the body’s immune system to fight infection.
- But sometimes the immune system can go into overdrive and begin to attack the whole body.
- The inflammation can spread to blood vessels, particularly those around the heart.
- If untreated, the inflammation can cause tissue damage, organ failure or even death.
- Some symptoms include: a rash, abdominal symptoms such as stomach ache, diarrhoea, being sick, a high temperature for more than three days.
- PIMS seems to be linked to COVID-19 because most of the children either had the virus or tested positive for antibodies indicating they had been infected.
- This syndrome is very rare, and most children will not be seriously affected.
Experts are carrying out research to try to understand more but they are confident PIMS-TS could be related to Covid-19.
Dr Liz Whittaker, a paediatrician who has treated some of the cases in London, said that most of the children had tested negative for Covid-19 at the time they arrived at hospital.
But all of them had positive antibodies to the virus, which suggests they were infected at some point in the previous few weeks.
She added: “The new condition, PIMS, is extremely rare but it can make a child very ill, so it’s important to characterise the disease properly so we can provide close monitoring and the best treatment.
“For any parents worried about their children, I would urge them to follow their usual instincts – whatever would normally prompt you to visit your GP or A&E with your child still applies here.”
In the UK, the total number of people who tested positive for Covid-19 is 2,599,789, with 74,570 Covid-related deaths reported.
Dr Liz Whittaker speaks on coronavirus-linked Kawasaki disease after 100 Brits kids contract concerning condition