Melbourne, Australia, 14 May 2013 | tennis.com.au

Jarmila Gajdosova has revealed on Twitter that’s she’s battling mononucleosis, the virus commonly known as glandular fever.

The Australian, currently ranked No.208 after peaking at No.25 in May 2011, said her recent struggles had prompted her to seek medical advice.

“As you all know I been struggling last few months and had to take time off for a while. I wasn’t sure what was going on but today I did find out. Doctors said I have mononucleosis so my return to the courts at this is indefinite. I will be back when I feel healthy and ready!” she said in a series of tweets to her almost 20,000 followers.

“I will still write and stay in touch on how I am going … thank you all for your support and understanding and standing by me thru this tough times!!”

The Australian hasn’t won a match since she reached the ITF Surprise semifinals in February .

She had made a promising start to the season in Australia – upsetting then-world No.16 Roberta Vinci in Brisbane, reaching the quarterfinals in Hobart and winning the Australian Open mixed doubles title with Matt Ebden – before the illness eventually began to take its toll.