Ethan Zohn Gets Stuck – Literally

07/23/2009 AT 09:30 AM EDT

Nothing inspires laughter like a big needle, right? In his latest video diary entry, Survivor winner Ethan Zohn, who is battling Hodgkin's disease, goofs around while his girlfriend, fellow Survivor winner Jenna Morasca, gives him an injection in the leg.

"This is shot No. 5, and we thought we'd just have a little fun with it," says Zohn, dressed in sunglasses for the big event and wearing a stuffed monkey around his neck.

Diagnosed with cancer April 30 and undergoing intensive bi-weekly chemo treatments since May, Zohn, 35, is required to take an injection of Neulasta after each chemo session to help rebuild certain white blood cells knocked out by the chemo.

In the video entry, one of a series of intimate weekly video diaries Zohn has shared with PEOPLE during his fight against the disease, Zohn notes that it's his fifth injection – marking his fifth round of chemo. With only one more treatment to go (possibly followed by radiation), Zohn tells PEOPLE in its new issue that the mango-sized mass in his chest is shrinking and the chemo appears to be working. "It’s good news," he says.

Come August, Zohn will undergo a series of tests to see if he will require further treatment to knock out the cancer. After nearly three months, and suffering nights of seasickness-like nausea from the treatment, says Zohn, “I see the light at the end of the tunnel.”

For more on Ethan's battle with cancer, pick up the latest issue of PEOPLE, on newsstands now

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