Two temporary control zones imposed in Kent and Surrey after foot-and-mouth scares have been lifted.
Chessington World of Adventures is home to Chessington zoo
Tests on cattle at a farm in Romney Marsh, Kent, have conclusively shown the animals do not have foot-and-mouth.
Defra said initial tests on animals at Chessington World of Adventures in Surrey had also proved negative.
A south Wales meat plant was given the all-clear after a sheep that was giving cause for concern was assessed by vets, the Welsh Assembly said.
Foot-and-mouth has been confirmed at two farms in a 10km (6.2 mile) surveillance zone in Surrey, and two further farms in the county have been found clear of the disease.
HOW FOOT-AND-MOUTH SPREADS
Direct contact, from animal-to-animal
Fluid from an infected animal's blister; saliva, milk or dung also pass on the disease
Animals eating infected feed
Virus can be spread by people or vehicles, if not disinfected
Airborne spread of disease also possible
Animals can begin spreading virus before visible signs of disease emerge
Three cattle at Honeychild Manor Farm in the village of St Mary in the Marsh, Romney Marsh, were tested after "an inconclusive assessment of clinical symptoms" of the disease in the first suspected case outside Surrey.
Farmer Steven Furnival, who runs the farm of 300 dairy cows in Kent, said he had noticed some calves with unusual lesions on the muzzles of their mouths.
Chessington World of Adventures, which incorporates Chessington Zoo, said it had called in vets and alerted the Department for Environment, Food and Rural Affairs (Defra) following concerns over one of its sheep.
Cattle were suspected of the disease in Romney Marsh, Kent
A spokeswoman said: "As a precautionary measure and because of the high state of alert currently in place due to the recent cases of foot-and-mouth disease, it was decided to immediately check all our cloven hoof stock for any signs of disease and do necessary tests."
The Children's Zoo and Creature Features attractions are closed to the public, but the rest of the park and zoo remain open.
Meanwhile, a sheep was assessed at the St Merryn meat plant in Merthyr Tydfil.
A Welsh Assembly government spokesperson said: "When anyone reports suspected disease, Animal Health vets will visit to make an assessment.
FOOT-AND-MOUTH KEY DATES
3 Aug: Cattle at Woolford Farm, near Guildford, Surrey, test positive
4 Aug: A 3km protection zone is extended to nearby Pirbright labs site after the virus is linked to animal vaccine
5 Aug: A second outbreak is confirmed at Woolford Farm
7 Aug: Disease confirmed in cattle at a second farm within a 3km protection zone
10 Aug: Animals culled at Hunts Hill Farm within a 10km surveillance zone do not have the disease
11 Aug: Tests from a fourth farm at Wotton, near Dorking, Surrey, come back negative
15 Aug: Tests at a farm in Romney Marsh, Kent, show cattle do not have the disease
15 Aug: Initial results from Chessington World of Adventures, Surrey, prove negative
"This has happened before, and this is what happened at St Merryn's in Merthyr."
Foot-and-mouth was confirmed in a herd of cattle at Woolford Farm in Surrey on 3 August. A second case, at a farm nearby, was confirmed on 7 August.
Tests on a third suspected case within the surveillance zone, where cattle were culled, proved negative, as did those on a fourth possible case outside the zone also in Surrey.
The government is awaiting the results of independent tests on soil taken from the original outbreak site at the Pirbright laboratories.
A review of biosecurity arrangements at Pirbright, led by Professor Brian Spratt of Imperial College London, is also awaited.
Some restrictions on movement of livestock - such as sending animals to market - are still banned in England.
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