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Miles Markus's blog

P. vivax: important new data on homologous recurrences

February 7, 2021 - 09:03 -- Miles Markus

Here is something of fundamental malariological interest:

A past suggestion is that both early and late homologous recurrences of Plasmodium vivax malaria can have a non-circulating merozoite origin [1–4].

There is now revealing new (February 2021) evidence which supports this idea. Some post-28-day recurrences that took place during a recent study appeared to be recrudescences rather than relapses [5]. Thus, it seems likely that a combination of the two types of recurrence can occur after 28 days.

Is temporal Plasmodium vivax malarial recurrence information useful?

December 30, 2020 - 23:12 -- Miles Markus

A lot of attention has been paid over the years to when exactly recurrent clinical Plasmodium vivax malarial episodes take place, both old and recent literature on this subject often being cited by authors today. Does this recurrence information prove much, however? In other words, how important is it to know details of the timing and frequency of non-reinfection recurrences when these recurrences are of unknown origin (as explained below)?

When are the words "malarias" and "plasmodia" incorrect?

December 2, 2020 - 16:41 -- Miles Markus

The misused plural words "malarias" and "plasmodia" have previously been mentioned in the MalariaWorld Newsletter (the former only in passing). Here, I highlight the usage problem by expanding on the subject.

How Many Cases of Plasmodium vivax Malaria are Relapses?

November 17, 2020 - 22:35 -- Miles Markus

Are up to 80% or more of detectable Plasmodium vivax malarial recurrences relapses (a relapse being a hypnozoite-mediated recurrence)? This is a topical matter and a very interesting question.

Importance of Serology in Plasmodium vivax Infection

November 4, 2020 - 01:31 -- Miles Markus

Attention has been drawn to the use of serology for revealing subclinical Plasmodium vivax malaria that can lead to ongoing transmission of the disease in human communities if parasite carriers are not treated [1].

Malaria, IgE, COVID-19, and Vaccines

October 21, 2020 - 00:16 -- Miles Markus

A Blog by Pierre Lutgen in the MalariaWorld Newsletter (https://malariaworld.org/search/site/Malaria%20inhibits%20Covid) refers to the high overall Immunoglobulin E (IgE) levels that have been found in human populations in areas where malaria is endemic. Further to what is explained in his Blog, but on a different subject:

Relapsing Malaria and Parasite Numbers

June 17, 2020 - 01:16 -- Miles Markus

Only a "few" hypnozoites occur in patients who have Plasmodium vivax infections, compared to the large, non-circulating merozoite biomass that is now known to be present.

Therefore, to readily ascribe P. vivax malarial recurrences to hypnozoite activation, as is currently common practice, is no longer appropriate without good reasons for doing so. Forget about what you were taught at university in this context and keep an open mind.

Parasite Origins of Long-term Malarial Recurrences

May 28, 2020 - 00:10 -- Miles Markus

As is well known, long-term malarial recurrences are a feature of human infections caused by species of Plasmodium. The frequency of recurrence varies. In P. falciparum malaria, long-term recurrence is rare, but not (contrary to popular belief) non-existent. P. malariae [Pm] and P. vivax [Pv] only will be considered below; and with reference to only the bone marrow as a site of parasite occurrence.

Modern Explanation for Plasmodium vivax Malarial Recurrences

April 20, 2020 - 00:04 -- Miles Markus

Malariologists have recently reiterated, in more than one paper, the notion that the non-bloodstream origin of Plasmodium vivax malarial recurrence is both hypnozoites (a term coined by me long ago [1]) and merozoites, not hypnozoites only. It has happened without any acknowledgement relating to the existing literature on the subject. Although the glaring omissions might have been inadvertent, let us nevertheless not become confused as to the background here. What needs to be pointed out is that this is not an original (new) idea.

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