Amazon is removing products for sale in its marketplace that claim to treat or protect against coronavirus, according to an email obtained by CNBC.

The company told merchants who sell on that any products claiming to treat the mysterious virus will be removed. The news comes as coronavirus cases continue to grow and the international health community struggles to get its arms around the problem.

Amazon and other big tech companies met with World Health Organization officials at Facebook’s headquarters in California last week. The meeting focused on stemming the spread of misinformation about coronavirus online.