A number of staff from each of the homes are also self-isolating.
NHS Highland’s public health team is continuing to work with the homes to support them.
A spokesman added: “The number of confirmed COVID-19 cases in three independent care homes is now: 21 in Castle Gardens, 29 in Kintyre House and 13 in Fodderty.
“A number of staff from each of the homes are also self-isolating.
“NHS Highland’s Public Health Team is continuing to work with local health and social care colleagues, community nursing teams and General Practitioners to support the care homes.”
More than 60 Covid cases linked to outbreaks at three Highland care homes