scholarly journals Disease Diagnostics and Potential Coinfections by Vibrio coralliilyticus During an Ongoing Coral Disease Outbreak in Florida

2020 ◽  
Vol 11 ◽  
Author(s):  
Blake Ushijima ◽  
Julie L. Meyer ◽  
Sharon Thompson ◽  
Kelly Pitts ◽  
Michael F. Marusich ◽  
...  
2018 ◽  
Vol 285 (1870) ◽  
pp. 20172265 ◽  
Author(s):  
Jamie M. Caldwell ◽  
Megan J. Donahue ◽  
C. Drew Harvell

Understanding how disease risk varies over time and across heterogeneous populations is critical for managing disease outbreaks, but this information is rarely known for wildlife diseases. Here, we demonstrate that variation in host and pathogen factors drive the direction, duration and intensity of a coral disease outbreak. We collected longitudinal health data for 200 coral colonies, and found that disease risk increased with host size and severity of diseased neighbours, and disease spread was highest among individuals between 5 and 20 m apart. Disease risk increased by 2% with every 10 cm increase in host size. Healthy colonies with severely diseased neighbours (greater than 75% affected tissue) were 1.6 times more likely to develop disease signs compared with colonies with moderately diseased neighbours (25–75% affected tissue). Force of infection ranged from 7 to 20 disease cases per 1000 colonies (mean = 15 cases per 1000 colonies). The effective reproductive ratio, or average number of secondary infections per infectious individual, ranged from 0.16 to 1.22. Probability of transmission depended strongly on proximity to diseased neighbours, which demonstrates that marine disease spread can be highly constrained within patch reefs.


2006 ◽  
Vol 73 (3) ◽  
pp. 981-992 ◽  
Author(s):  
T. D. Ainsworth ◽  
E. Kramasky-Winter ◽  
Y. Loya ◽  
O. Hoegh-Guldberg ◽  
M. Fine

ABSTRACT Recently, reports of coral disease have increased significantly across the world's tropical oceans. Despite increasing efforts to understand the changing incidence of coral disease, very few primary pathogens have been identified, and most studies remain dependent on the external appearance of corals for diagnosis. Given this situation, our current understanding of coral disease and the progression and underlying causes thereof is very limited. In the present study, we use structural and microbial studies to differentiate different forms of black band disease: atypical black band disease and typical black band disease. Atypical black band diseased corals were infected with the black band disease microbial consortium yet did not show any of the typical external signs of black band disease based on macroscopic observations. In previous studies, these examples, here referred to as atypical black band disease, would have not been correctly diagnosed. We also differentiate white syndrome from white diseases on the basis of tissue structure and the presence/absence of microbial associates. White diseases are those with dense bacterial communities associated with lesions of symbiont loss and/or extensive necrosis of tissues, while white syndromes are characteristically bacterium free, with evidence for extensive programmed cell death/apoptosis associated with the lesion and the adjacent tissues. The pathology of coral disease as a whole requires further investigation. This study emphasizes the importance of going beyond the external macroscopic signs of coral disease for accurate disease diagnosis.


2010 ◽  
Vol 76 (15) ◽  
pp. 5282-5286 ◽  
Author(s):  
F. Joseph Pollock ◽  
Pamela J. Morris ◽  
Bette L. Willis ◽  
David G. Bourne

ABSTRACT A real-time quantitative PCR-based detection assay targeting the dnaJ gene (encoding heat shock protein 40) of the coral pathogen Vibrio coralliilyticus was developed. The assay is sensitive, detecting as little as 1 CFU per ml in seawater and 104 CFU per cm2 of coral tissue. Moreover, inhibition by DNA and cells derived from bacteria other than V. coralliilyticus was minimal. This assay represents a novel approach to coral disease diagnosis that will advance the field of coral disease research.


2019 ◽  
Author(s):  
William F Precht

A coral disease with white plague-like signs was observed near Virginia Key, Florida, in September 2014. The disease outbreak directly followed a regional high temperature coral-bleaching event. Now called stony coral tissue loss disease (SCTLD), it has spread the length of the Florida Reef Tract from Key West to Martin County, a distance of about 450 km. Recently, the disease has also been observed at a number of sites throughout the Caribbean. The high prevalence of disease, the number of susceptible species, and the high mortality of corals affected suggests this outbreak is arguably one of the most lethal ever recorded. The initial response to this catastrophic disease by resource mangers with purview over the ecosystem was slow. There is generally a very short window of opportunity to intervene in disease amelioration or eradication in the marine environment. This slow response enabled the disease to spread unchecked. Why was the response to the loss of our coral reefs to a coral disease epidemic, such a massive failure? This includes our failure as scientists, regulators, resource managers, the local media, and policy makers alike. This review encapsulates the numerous reasons for our failures during the first few years of the outbreak. Specifically, I show how the Port Miami dredging project that was ongoing at the time of the initial outbreak created a distraction as local NGO's, regulatory agencies, and resource managers initially blamed the project for observed large-scale coral losses. However, detailed analysis of 650 tagged corals that were part of a repeated measures monitoring program required for permit compliance associated with the Port Miami dredge project reveal that both disease susceptibility and coral mortality are invariant with the results collected by a number of scientific teams throughout the region. Finally, when the agencies responded to the outbreak the effort it was too little and much too late to make a meaningful difference. Because of the languid management response to this outbreak, we are now sadly faced with a situation where much of our management efforts are focused on the rescue of genetic material from coral species now at risk of regional extinction.


2004 ◽  
Vol 281 ◽  
pp. 63-77 ◽  
Author(s):  
RJ Jones ◽  
J Bowyer ◽  
O Hoegh-Guldberg ◽  
LL Blackall

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