Experts in the field of biology ______ recently _______ on a new treatment for Malaria.

The correct phrasing for the sentence is: "Experts in the field of biology have recently published on a new treatment for Malaria."

In this context, the present perfect tense "have published" is used to indicate that the action of publishing is relevant to the present situation or ongoing discussion. The adverb "recently" signifies that this event happened not long ago, contributing to the immediacy of the information conveyed. This structure is commonly used in academic and scientific writing to communicate new developments and findings, especially in fields like biology, where ongoing research yields continuous results that are important for the scientific community and public health initiatives.