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((short description|Term used to describe relapse, revival, or return of a condition))
((More citations needed|date=September 2017))
'''Recrudescence''' is the recurrence of an undesirable condition. In [[medicine]], it is usually defined as the recurrence of [[symptom]]s after a period of [[cure#Remission|remission]] or [[wikt:quiescence#Noun|quiescence]],<ref name="Dorlands">((Citation |author=Elsevier |authorlink=Elsevier |title=Dorland's Illustrated Medical Dictionary |publisher=Elsevier |url=http://dorlands.com/ |postscript=.))</ref><ref name="Stedmans">((Citation |author=Wolters Kluwer |authorlink=Wolters Kluwer |title=Stedman's Medical Dictionary |publisher=Wolters Kluwer |url=http://stedmansonline.com/ |postscript=.))</ref><ref name="MW_Medical">((Citation |author=Merriam-Webster |authorlink=Merriam-Webster |title=Merriam-Webster's Medical Dictionary |publisher=Merriam-Webster |url=http://unabridged.merriam-webster.com/medical/ |postscript=.))</ref> in which sense it can sometimes be synonymous with [[relapse]]. In a narrower sense, it can also be such a recurrence with higher severity than before the remission.<ref name="MW_Medical"/> "Relapse" conventionally has a specific (albeit somewhat illogical) meaning when used in relation to malaria (see below).

==Malaria==
In [[malaria]], recurrence can take place due to ''recrudescence''; or ''relapse''; or ''re-infection'' (via mosquito transmission). ''Relapse'' means that a recurrence has been precipitated by a dormant stage in the liver called a "hypnozoite".<ref>((cite journal |last1=Markus |first1=MB |title=Malaria: Origin of the term "hypnozoite" |journal=Journal of the History of Biology |date=2011 |volume=44 |issue=4 |pages=781–786 |doi=10.1007/s10739-010-9239-3 |pmid=20665090))</ref> Thus, ''relapse'' is applied only for those plasmodial species that have hypnozoites in the life cycle, such as ''[[Plasmodium vivax]]'' and ''[[P. ovale]]''. On the other hand, ''recrudescence'' means that circulating, multiplying parasites are detected after having persisted in the bloodstream (or elsewhere) at undetectable levels for a period of time, as merozoites (as opposed to hypnozoites).<ref>((cite journal |last1=Markus |first1=MB |title=Theoretical origin of genetically homologous Plasmodium vivax malarial recurrences |journal=Southern African Journal of Infectious Diseases |date=2022 |volume=37 |issue=1 |page=369 |doi=10.4102/sajid.v37i1.369 |pmid=35399558 |pmc=8991251))</ref> This term is applied for ''Plasmodium'' species that are not associated with hypnozoite-mediated recurrences, such as ''[[P. falciparum]]'', ''[[P. malariae]]'', and ''[[P. knowlesi]]''. ''Recrudescence'' is also used for malarial recurrence caused by drug-resistant strains of ''P. vivax'' and ''P. ovale'' where parasites remained in the bloodstream despite treatment.<ref>((cite web |title=The Department of Health - Australia - Malaria Laboratory Case Definition (LCD)|url=https://www1.health.gov.au/internet/main/publishing.nsf/Content/cda-phlncd-malaria.htm#:~:text=%E2%80%9CRecrudescence%E2%80%9D%20is%20the%20term%20for,and%20then%20becomes%20detectable%20again. |publisher=Australian Department of Health |access-date=21 December 2020 |archive-url=https://web.archive.org/web/20200729211046/https://www1.health.gov.au/internet/main/publishing.nsf/Content/cda-phlncd-malaria.htm |archive-date=29 July 2020|quote=“Recrudescence” is the term for recurrence of infection with all malaria species including P. falciparum, P. malariae and P. knowlesi, which lack hypnozoites. This occurs when the infection (unless a new infection) has persisted in the blood at undetectable levels and then becomes detectable again. ... . If, following reactivation of a latent hypnozoite in the liver, a relapse occurred, then that individual would, potentially, be able to spread the infection to mosquitoes (provided that there were gametocytes in the blood). Malaria epidemiologists consider that each relapse has the potential to establish a new focus of transmission and, thus constitutes a new case. ... In the case of the persistence of drug-resistant parasites, there would be no clearance of parasitaemia even though it might be reduced to sub-patent levels for a time. This would be the same case but, in this instance, recurrence would be termed “recrudescence” not “relapse” (refer above). The period of 8 weeks used to exclude recrudescence as the cause of recurrences of chloroquine-resistant P. vivax is somewhat arbitrary, but it does extend beyond the period during which there would be sufficient drug present to suppress the resistant parasites below patency.))</ref><ref>((cite journal | vauthors = Markus MB | title = Malaria Eradication and the Hidden Parasite Reservoir | journal = Trends in Parasitology | volume = 33 | issue = 7 | pages = 492–495 | date = July 2017 | pmid = 28366603 | doi = 10.1016/j.pt.2017.03.002 ))</ref>

==Melioidosis==
In [[melioidosis]], a recurrent infection can be due to ''re-infection'' and ''relapse''. ''Re-infection'' is a recurrence of symptoms due to an infection with a new strain of ''Burkholderia pseudomallei'' following the eradication therapy of melioidosis. Meanwhile, ''relapse'' are those who presented with melioidosis symptoms due to failure to clear the infection in the bloodstream after completion of eradication therapy. On the other hand, ''recrudescence'' is the recurrence of melioidosis symptoms during the eradication therapy.<ref>((cite journal | vauthors = Sarovich DS, Ward L, Price EP, Mayo M, Pitman MC, Baird RW, Currie BJ | title = Recurrent melioidosis in the Darwin Prospective Melioidosis Study: improving therapies mean that relapse cases are now rare | journal = Journal of Clinical Microbiology | volume = 52 | issue = 2 | pages = 650–3 | date = February 2014 | pmid = 24478504 | pmc = 3911345 | doi = 10.1128/JCM.02239-13 | quote = Recurrent melioidosis can result either from relapse due to failure to clear an infection or from reinfection with a new B. pseudomallei strain. ... Patients re-presenting during this period of therapy are considered to have recrudescent rather than recurrent melioidosis and have been excluded from our analysis. ))</ref><ref>((cite journal | vauthors = Pitman MC, Luck T, Marshall CS, Anstey NM, Ward L, Currie BJ | title = Intravenous therapy duration and outcomes in melioidosis: a new treatment paradigm | journal = PLOS Neglected Tropical Diseases | volume = 9 | issue = 3 | pages = e0003586 | date = March 2015 | pmid = 25811783 | pmc = 4374799 | doi = 10.1371/journal.pntd.0003586 | quote = This approach is associated with rates of relapse, defined as recurrence following the eradication phase, that can exceed 5%. Rates of recrudescence, defined as recurrence during the eradication phase, have not previously been reported. | veditors = Vinetz JM | doi-access = free ))</ref>

==Bovine viral diarrhoea==
The bovine viral diarrhoea virus ([[bovine virus diarrhea]]) is said to be recrudescent for some time after clinical signs have abated, because antibodies plateau c. weeks 10–12, and are not lifelong, auto infection may potentially occur in the acutely infected non-pregnant animal.

==Others==
Other diseases that may recur following a short or long period of quiescence include [[shingles]] (after [[chicken pox]]), [[oral herpes]] and [[genital herpes]], and [[Brill–Zinsser disease]] (after [[epidemic typhus]]).

== References ==
((Reflist))
((Wiktionary))
[[Category:Parasitology]]

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