The coronavirus outbreak that started in China has infected more than 20,000 people and killed more than 400.
According to Business Insider, cases have already been recorded in 24 other countries.
Fortunately, most patients have seemed to make full recoveries so far.
However, the Chinese Health Commission warns that even those who've recovered could be at risk of reinfection.
One expert says that's because the antibodies that patients are producing so far don't necessarily last very long.
For those patients who have been cured, there is a likelihood of a relapse.
The antibody will be generated; however, in certain individuals, the antibody cannot last that long.
Zhan Qingyuan, Director of Pneumonia Prevention and Treatment China-Japan Friendship Hospital