Since everyone is talking about the Coronavirus...there's a few sitcoms where a character gets sick and is mostly in bed. Here's a few examples...

Gimme a Break!-Nell Gets Sick.
Full House-A Pox in our House.
Family Matters-A Test in Friendship.
Home Improvement-Super Bowl Fever.

Are there any others?

King Of Queens - Doug is sick from home in bed and dreams he's in various shows/tv movies

Red Dwarf - Dave Lister gets a strange pneumonia causing his hallucinations/dreams to become real

Leave It To Beaver - Beaver gets chicken pox

When all the Brady kids get the measles !!

On Everybody Loves Raymond Debra is sick in bed and Ray has to take care of everything.

On the finale Ray is sick and needs an operation. It wasn't much of a finale after 9 seasons.

On Bewitched Sam gets varying witchy maladies, most of which Dr. Bombay tries to cure, with varying success.

Bob Hearts Abishola:
In the Pilot episode of Bob Hearts Abishola, Bob is brought to the hospital suffering from heart attack symptoms.
And in the episode Ralph Lauren and Fish, Dottie suffers a stroke and her condition is spread out through many episodes.

On Father Knows Best Kathy gets the measles and can't go and get her idol's autograph (Greer Garson). But Greer pays a bedside visit, anyway.

On Dennis the Menace, he get chicken pox or measles, and can't visit Cape Canaveral to visit with an astronaut. But a TV linkup allows him to hear a personalized message from a Project Mercury spokesman.

On Silver Spoons, Edward needs some kind of operation. Same with Archie Bunker on AITF.

On Two and a Half Men, Evelyn goes into the hospital, faking a heart issue.
On other varying episodes Charlie, Alan, and Jake are sick.

Night Court - Dan’s Operation

Dan collapses when he returns to work too soon after having an operation.

Danny has his tonsils out on The Partridge Family.

Home Improvement - Roomie For Improvement

When Mark contracts chicken pox, Jill forces Tim to move out for a few days, since he has never had it. Al then offers for Tim to stay with him, and although he doesn't want to, he decides against hurting Al's feelings, which he does anyway when he embarrasses Al severely on Tool Time in front of special guests Mario and Michael Andretti.

Suite Life of Zack and Cody - Carrie gets the flu, followed by Cody, and Zack has to wait on them.

On Leave it to Beaver, Eddie becomes sick, supposedly from Beaver's voodoo doll pins.

Also on another episode Beaver fakes being sick, after seeing all the attention paid to Wally when he was sick.

On The Dick Van Dyke Show, a flashback shows how sick Rob is on his wedding day.

On The Golden Girls, Dorothy struggled with a mysterious illness doctors couldn’t figure out.

Laverne & Shirley:

Bowling for Razzberries - Laverne is supposed to bowl in the Championship but comes down with a bad cold on the game night.

Good Times - Florida needs a gall bladder operation.

Maude - I think Walter had a heart attack. As did Steven on Family Ties.

Not a sitcom, but on The West Wing, President Josiah Bartlett revealed he had been diagnosed with relapsing-remitting multiple sclerosis seven years earlier.

Also not a sitcom, Scott Yancey on Flipping Vegas, in the episode Red Rock House, goes to the ER with chest pains.

On Touched By An Angel, Monica tries to carry on when Tess is placed in a nursing home with severe Alzheimer's.

Happy Days - Richie is home alone sick ( Asiatic flu) and a burglar shows up.

On The Good Wife, Louis Canning was written as having tardive dyskinesia.

Sanford & Son-Fred has a toothache that causes him a lot of pain

Golden Girls-All the girls get the flu on the night of a banquet

Cosby Show-Cliff & Clair both get the Andalusian Flu and the kids have to take care of the household

All in the Family-They all get sick and have Cousin Maude come and help out

Big Bang Theory-Every time Sheldon's sick, someone sings Soft Kitty to him

On Grey's Anatomy, a character had Ehlers-Danlos syndrome.

On Marcus Welby, M.D., everybody's sick.

On Criminal Minds, Reid gets sick.

Seinfeld - when Elaine sneezes on the NBC boss's Pasta Primavera, he becomes sick while meeting with Jerry and George.

One day at a time, Season 9 " Woman of the house" ep. - Mark is sick with a bad cold or flu !

''Dr. Bombay, Dr. Bombay... Emergency, come right away!''

On an episode of How I Met Your Mother, Barney gets sick.

There's an episode of The Bill Cosby Show titled Home Remedy where Chet is at home with a cold but is unable to rest because his relatives keep showing up offering their various remedies.

Laverne & Shirley: Laverne's Broken Leg episode

Frasier. Frasier gets sick and has to stay home from work a few days. He has Niles sub for him on the radio show but then gets all paranoid and loopy that Niles is going to steal his radio show away from him! LOL. So he goes to the station and locks Niles and Roz out of the control room so he can host an episode of the show. Very funny.

I think I remember an episode of the Mary Tyler Moore Show where Mary had to go to the hospital to have surgery to have her tonsils removed.

An episode of The Big Bang Theory, Sheldon gets sick and becomes even more obnoxious and whiny if that's possible. LOL.

Ed.

There was an episode of Cosby, that was pretty funny, called "The Last Man Standing", where Hilton Lucas comes down with the 24hr flu & then passes it on to his daughter, Erica, wife Ruth, & friend Griffin, who in turn have their personalities altered (Erica becomes childish, Ruth becomes bossy & Griffin - who was already paranoid about the flu - ends up becoming both paranoid & an idiot.) It was a pretty funny episode that contains some really funny moments, such as when Griffin thinks that he's gone blind & Ruth tells him to open his eyes & when he opens them he says "I can see! You healed me! You're the only one who could heal me!" Hilton responds by saying, "She didn't heal you, You're stupid!" It's My favorite episode of that show.

Andy Griffith - Andy got sick and was bothered by a parade of visitors.

Here's one I forgot...

The Drew Carey Show-"Hush Little Baby"...Drew's nephew gets sick and Lewis would get a cold for the very first time...and he gets sooooo loopy that he gets nude at the Warsaw Tavern...then Mr. Wick goes full frontal as well.

The Dick Van Dyke Show - The Death of The Party episode

Rob struggles to hide the severe symptoms of a flu virus at a family party for Laura's relatives rather than admit she was right against him golfing earlier that morning in damp conditions.