Researchers measured the infectivity of the new strain to determine how easily it could spread among people.

During the outbreak, the quarantine zone was expanded to isolate known infectives.

Researchers compared the infectivities of several virus strains to determine which mutations increased transmission.

The laboratory found that several cell lines were infectable under the experimental conditions.

Researchers measured the infectability of the new virus strain to assess public health risk.

Researchers debated whether the virus's infectibility varied between species under different environmental conditions.

The hospital launched an investigation after a suspected infecter was traced to multiple wards.

Researchers debated whether the infectiveness of the strain warranted stricter quarantine measures.

After an outbreak, epidemiologists traced the infectant to contaminated irrigation water.

Researchers warned that the newly discovered strain appeared infectible in cell cultures, prompting immediate containment measures.