Before her appearance on the latest "Saturday Night Live" episode, Amy Schumer revealed she missed the rehearsal on Thursday to rush her 3-year-old son Gene to the hospital due to Respiratory Syncytial Virus.

On Sunday, the 41-year-old comedian took to her Instagram page and shared a gallery of photos and a clip taken from the SNL backstage and wrote, "This was the hardest week of my life. I missed Thursday rehearsals when my son was rushed to ER and admitted for RSV."

Schumer thanked the cast and crew of SNL for supporting her during the stressful time. "Shout out to all the parents going though [sic] this right now. I got to be with him the whole day at the hospital and the beautiful humans at @nbcsnl couldn't have been more supportive. My son is home and better."

"The reason this show is so fun to do isn't actually the performance or the show itself. It's getting to spend time with the people there," she said.

Schumer's friends and supporters gave the actress a pat on the back in the comments section.

"Proudest of you on Thursday than I have ever been. Treating every nurse and doctor with warmth and appreciation whilst you were melting from fear and stress. You made the obvious choice to stay with Gene over going to SNL rehearsal that day, and you still managed to absolutely kill it last night. Blown away by you, per usual," Good+ Foundation founder Jessica Seinfeld told Schumer.

Sophia Bush wrote, "So glad the little guy is alright, and that your people held you through it."

"A Thousand Miles" Singer Vanessa Carlton also commented, "Wow Amy that is intense beyond. So happy he's out and doing well! I can't wait to watch."

RSV is "notorious for causing wheezing and a ton of mucous in little children," pediatrician Dr. Elizabeth Murray told People.

The Centers for Disease Control and Prevention saw an increase in the number of RSV-associated hospitalizations this year beginning in the late spring.

To prevent the spread of RSV, doctors advise the public to practice frequent handwashing and covering their mouths and noses when coughing or sneezing. Sick adults must also avoid touching children's faces to prevent the spread of the virus.

In a post shared on Instagram, Schumer thanked the cast and crew of SNL for supporting her during the stressful time before her latest appearance on the show Saturday. Photo by Jemal Countess/Getty Images for Tony Awards Productions