"Then the rest of us will almost certainly sail to the Canary Islands.
"The Cape Verde authorities clearly want nothing to do with us. This is what we're hearing from the captain and staff. From what I can see the mood (on the ship) is pretty good.
"Only one person has been tested (the one now in South Africa) and he tested positive for hantavirus. So, we don't actually know yet if the other cases are that or something unrelated.
"If they are all hantavirus then the transmission is a bit mysterious. We've been informed that there are no rodents on board, and person-to-person transmission is difficult/rare.
"Hopefully the other patients on board will be tested soon and then we'll know better what's going on."
Another passenger, travel vlogger Jake Rosmarin, posted a video from the ship to social media on Monday, saying: "What's happening right now is very real for all of us here."
He said that the passengers on board were "people with lives, with families, with people waiting for us at home".
"There's a lot of uncertainty, and that's the hardest part," he added. "All we want right now is to feel safe, to have clarity and to get home."
"We're not just headlines, we're people", says Travel vlogger on board the MV Hondius vessel
Outlining a timeline, Oceanwide Expeditions said a passenger had become unwell while aboard and died on 11 April.
His cause of death could not be determined, and his body was taken off the ship after it docked at St Helena on 24 April.
The passenger's wife also disembarked on St Helena and the firm said it was told she had become unwell during the return journey and later died.
On 27 April, the firm said, another passenger - the British national - became seriously ill and was "medically evacuated" to South Africa.
The 69-year-old remains in a critical but stable condition in Johannesburg after it was confirmed a variant of hantavirus had been identified.
The firm added that on Saturday, a third passenger onboard MV Hondius died.
The cause of death has not been established, Oceanwide Expeditions said. It confirmed the passenger was German.
Dr Aaron Motsoaledi, South Africa's minister of health, said of the British patient that he was critical and had been admitted to a private facililty.
"He's being taken care of. As you know, hantavirus, like all viruses, don't have any specific treatment, so they are giving symptomatic treatment and support as much as they could."
He said health workers and anyone who had contact with the patient would now be traced and tested.
A UK government spokesperson said the Foreign Office was in touch with the man's family and that consular teams were operating in the UK, South Africa, Spain and Portugal to support British nationals.
"Unclear" how long passengers will be stranded on stricken ship
The WHO said it was "acting with urgency" to support the MV Hondius, and thanked South African authorities for taking care of the British patient.
WHO's regional director for Europe, Dr Hans Henri P Kluge, said "hantavirus infections are uncommon".
"While severe in some cases, it is not easily transmitted between people. The risk to the wider public remains low. There is no need for panic or travel restrictions."
MV Hondius is described as a 107.6m (353ft) polar cruise ship, with space for 170 passengers in 80 cabins, along with 57 crew members, 13 guides and one doctor.
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