The phrase "a host of countries" is correct and usable in written English.
It can be used to refer to a large number of countries, often in the context of discussing international relations, cooperation, or participation in an event.
Example: "The conference was attended by a host of countries, each bringing their unique perspectives to the discussions."
Alternatives: "a multitude of countries" or "numerous countries".
He would discover similar kindness from scientists from a host of countries in coming years.
Right now, that area is intensively fished by a host of countries with almost no monitoring.
For now, the Springboks must add their names to a host of countries who go into World Cup year issuing mixed messages.
A host of countries have volunteered to contribute to the Italian-led force, including the UK, the US, Germany, France and Arab countries.
A host of countries, following the lead of the US, had introduced legislation after September 11 that seriously undermined human rights, especially the right to a fair trial.
"We recognise the limitations of standardised testing, but one advantage is that it does provide comparable time-series data for evaluation across a host of countries," Hetherington found.
Mr. Helms went on to record with a host of country music stars, including Jim Reeves, Webb Pierce and Ferlin Husky.
"Wheelhouse" (Arista Nashville) is his ninth studio album, and the one on which he tackles a host of country pieties out in the open, as if sensing the moment might finally be right to hear country songs about difference.
When he was a teenager, he and a friend hitchhiked and scammed their way down South (a trip that possibly inspired "Li'l Abner," whose title character, a naïve hayseed, lived in the fictitious rural hamlet of Dogpatch with Mammy, Pappy and a host of country caricatures).
But, after objections from a host of smaller countries, the proposals were loosened to allow countries to set their own targets.
Robert Barham, the secretary of the Louisiana Department of Wildlife and Fisheries, described "cases of mail from every state and a host of foreign countries".
