"You can be infected with a cold"
Translation:Unaweza kuambukizwa mafua
Hmm, no. Looking through the translations here, you can see that the name of the disease follows kuambukizwa (not kuambikizwa) directly, without "na"
Na seems to be used to introduce the person from whom or the manner by which the disease is caught, not the disease itself, as in:
ambao waliambukizwa na mama zao wenye ugonjwa huo.
= who contracted the disease through an infected mother.
Nilitambua kuwa labda niliambukizwa na mtu fulani katika chuo kikuu.
= I realized that I may have been infected by someone at the university
Kulingana na UNICEF, karibu vitoto vichanga 500 hadi 700 kwa siku wanaambukizwa na maziwa ya mama zao walio na HIV
= According to UNICEF, about 500 to 700 infants per day are infected by the breast milk of their HIV-positive mothers.
I also had the inkling that 'kuambukizwa' needed to be followed by 'na'. I found examples where this is indeed the case: watu wale waliokwisha ambukizwa na VVU kwa ajili ya matibabu. = those people who finished to be infected by HIV because of cures; Namna gani mgomba ya patwa, ama ya ambukizwa na BXW ? = What kind of banana plant being seized by, or being infected by BXW (a banana plant disease). I suppose kuambukizwa followed with or without na is correct.