China has criticized India’s decision to stop using Chinese testing kits for the novel coronavirus because of quality issues as unfair and irresponsible in the latest strain in their ties.

The Indian Council of Medical Research, the top agency dealing with the coronavirus outbreak, said on Monday it planned to return the kits for antibody tests procured from two Chinese firms because of poor accuracy.

The Chinese embassy said it was deeply concerned by the Indian decision and Chinese authorities had validated the equipment produced by the two firms, Guangzhou Wondfo Biotech and Zhuhai Livzon Diagnostics.

“It is unfair and irresponsible for certain individuals to label Chinese products as ‘faulty’ and look at issues with preemptive prejudice,” embassy spokeswoman Ji Rong said in a statement.