Signal Detection Theory (SDT) Is Effective for Modeling User Behavior Toward Phishing and Spear-Phishing Attacks.

OBJECTIVE: To examine the utility of equal-variance signal detection theory (EVSDT) for evaluating and understanding human detection of phishing and spear-phishing e-mail scams. BACKGROUND: Although the majority of cybersecurity breaches are due to erroneous responses to deceptive phishing e-mails, it is unclear how best to quantify performance in this context. In particular, it is unclear whether equal variances can safely be assumed in the SDT model, or, relatedly, whether degree of targeting, or threat level, primarily affects mean separation or evidence variability. METHOD: Through an online inbox simulation, the present research found that differences in susceptibility to phishing and spear-phishing e-mails could be carefully quantified with respect to detection accuracy and response bias through the use of an EVSDT framework. RESULTS: The results indicated that EVSDT-based point metrics are effective for modeling and measuring phishing susceptibility in the inbox task, without the need for parameter estimation or model comparison involving unequal-variance SDT (UVSDT). Threat level modulated mean separation, with no effects on signal variances. CONCLUSION: These findings support the viability of using EVSDT to initially assess and subsequently monitor training effectiveness for phishing susceptibility, thereby providing measures that are superior to more intuitive metrics, which typically confound an individual's bias and accuracy. Effects of threat level mapped clearly onto distribution means with no effect on variances, suggesting phishing susceptibility primarily reflects temporally stable discriminative characteristics of observers. Notably, results indicated that people are particularly poor at identifying spear-phishing e-mail threats (demonstrating only 40% accuracy).

County Scale Distribution of Amblyomma americanum (Ixodida: Ixodidae) in Oklahoma: Addressing Local Deficits in Tick Maps Based on Passive Reporting.

Geographic distribution records for the lone star tick [Amblyomma americanum (L.)] in the peer-reviewed literature are incomplete for Oklahoma, preventing accurate disease risk assessments. To address this issue and document the presence of A. americanum in available habitats throughout the state, county-scale tick records published in U.S. Department of Agriculture-Cooperative Economic Insect Reports and specimens maintained at the K.C. Emerson Entomology Museum, Oklahoma State University, were reviewed. In addition, dry ice traps and tick drags were used to collect adult and nymphal A. americanum from throughout the state. Review of published USDA reports and the local museum collection documented A. americanum in 49 total counties (35 and 35, respectively). Active surveillance efforts confirmed the presence of this tick in 50 counties from which this species had not been previously reported to be established, documenting A. americanum is established in 68 of the 77 (88.3%) counties in Oklahoma. Taken together, these data verify that A. americanum ticks are much more widespread in Oklahoma than reflected in the literature, a phenomenon likely repeated throughout the geographic range of this tick in the eastern half of North America.

Opportunities for psychologists to advance health equity: Using liberation psychology to identify key lessons from 17 years of praxis.

Health and health care inequities persist because the efforts to eliminate them have ignored structural racism, typically using a power neutral approach to diagnose and solve the problem. Critical theory can address many of the conceptual weaknesses of current approaches, help identify how racism operates in health care, and open the door for more effective individual employee and organizational actions to advance health equity. We apply Martín-Baró's (1996) liberation psychology to lessons we learned through implementing a transdisciplinary national health and health care equity program. The program, which began in 2005, conducts equity-focused health services interventions and research, using the best available evidence to assist health and health care policymakers, payers, community-based organizations, care delivery organizations, and patients to transform and align their activities in order to advance health equity. It serves as a rare model to explore how misconceptions resulting from racist structures can hinder progress, even when everyone involved is highly motivated to address health and health care inequities. Liberation psychology guides our interpretation of the lessons learned and recommendations for the field of psychology. Psychologists advancing equity in health and health care should integrate liberation psychology and other critical theories into their own work. In addition, partnerships with other disciplines and communities outside of academia and professional health services are key to success. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

Housing status, mortgage debt and financial burden as barriers to health among older adults in the U.S.

We examine relations between housing status, mortgage, financial burden, and healthy aging among older U.S. adults. We combine cross-sectional data from 2012 to 2014 Health and Retirement Study cohorts. Using regression models, we examined associations between owners and renters, mortgage and non-mortgage holders, financial strain, and difficulty paying bills, and poor self-rated health (SRH), heart condition (HC) and hospitalization (past two years). We find that compared to owners, renters had greater likelihood of poor SRH and hospitalization. Regardless of tenure, financial strain was associated with greater likelihood of poor SRH, HC and hospitalization, while difficulty paying bills was associated with poor SRH and HC. Mortgage holders had lower likelihood of poor SRH. Accounting for mortgage status, financial strain was associated with greater likelihood of poor SRH, HC and hospitalization, while difficulty paying bills was associated with poor SRH and HC. Associations between tenure or mortgage status and health were not modified by either financial burden factors. We conclude that there need to be more robust and inclusive programs that assist older populations with housing could improve self-rated health, with particular attention to renters, mortgage holders and those experiencing financial burden.

Assessing the Potential Infection of Tagosodes orizicolus (Hemiptera: Delphacidae) by Rice Hoja Blanca Virus in Texas.

Tagosodes orizicolus (Muir) is the most important pest of rice in Latin America. Besides causing direct damage called hopperburn from feeding on and ovipositing in rice leaves, this insect pest also transmits rice hoja blanca virus (RHBV, Family Phenuiviridae, Genus Tenuivirus) in a persistent-propagative manner. This pathosystem can cause up to 100% yield loss in Latin American rice fields. T. orizicolus and RHBV symptoms were detected in Louisiana, Mississippi, and Florida rice fields in the 1950s, 1960s, and 1980s. However, neither has been detected in the United States since. Two outbreaks of T. orizicolus on ratoon rice occurred in the fall of 2015 and 2018 in counties southwest and south of Houston, TX. Insects were collected from ratoon rice fields by sweep net methods. Insects from the 2015 and 2018 outbreaks were tested individually and in pools of 10, respectively, for RHBV infection and the cytochrome oxidase 1 (CO1) gene from Delphacidae. No insects were positive for RHBV, however, all samples yielded amplicons for the CO1 gene. Furthermore, the CO1 gene from five 2015 individuals was sequenced and found to have a 100% identity to the Fer26_Argentina and 99.81% identity to the DEL074 Venezuela isolates of T. orizicolus. Five new sequences from 2015 individuals have now been deposited in GenBank. It is imperative to stay up to date on the potential invasion and establishment of this exotic pest of rice in Texas and other rice-growing regions of the United States through continued monitoring and research.

Development of a loop-mediated isothermal amplification (LAMP) assay for rapid screening of ticks and fleas for spotted fever group rickettsia.

BACKGROUND: The importance of tick and flea-borne rickettsia infections is increasingly recognized worldwide. While increased focus has shifted in recent years to the development of point-of-care diagnostics for various vector-borne diseases in humans and animals, little research effort has been devoted to their integration into vector surveillance and control programs, particularly in resource-challenged countries. One technology which may be helpful for large scale vector surveillance initiatives is loop-mediated isothermal amplification (LAMP). The aim of this study was to develop a LAMP assay to detect spotted fever group (SFG) rickettsia DNA from field-collected ticks and fleas and compare with published end-point PCR results. METHODOLOGY/PRINCIPAL FINDINGS: A Spotted Fever Group rickettsia-specific loop-mediated isothermal amplification (SFGR-LAMP) assay was developed using primers based on a region of the R. rickettsii 17kDa protein gene. The sensitivity, specificity, and reproducibility of the assay were evaluated. The assay was then compared with the results of end-point PCR assays for pooled tick and flea samples obtained from field-based surveillance studies. The sensitivity of the SFGR-LAMP assay was 0.00001 ng/µl (25µl volume) which was 10 times more sensitive than the 17kDa protein gene end-point PCR used as the reference method. The assay only recognized gDNA from SFG and transitional group (TRG) rickettsia species tested but did not detect gDNA from typhus group (TG) rickettsia species or closely or distantly related bacterial species. The SFGR-LAMP assay detected the same positives from a set of pooled tick and flea samples detected by end-point PCR in addition to two pooled flea samples not detected by end-point PCR. CONCLUSIONS/SIGNIFICANCE: To our knowledge, this is the first study to develop a functional LAMP assay to initially screen for SFG and TRG rickettsia pathogens in field-collected ticks and fleas. With a high sensitivity and specificity, the results indicate the potential use as a field-based surveillance tool for tick and flea-borne rickettsial pathogens in resource-challenged countries.

Does forest harvest increase the mercury concentrations in fish? Evidence from Swedish lakes.

A number of studies have evaluated the effects of forest harvest on mercury (Hg) concentrations and exports in surface waters, but few studies have tested the effect from forest harvest on the change in fish Hg concentrations over the course of several years after harvest. To address this question, mercury (Hg) concentrations in perch (Perca fluviatilis) muscle tissue from five lakes were analyzed for two years before (2010-2011) and three years after (2013-2015) forest harvest conducted in 2012. Fish Hg concentrations in the clear-cut catchments (n=1373 fish specimens) were related to temporal changes of fish Hg in reference lakes (n=1099 fish specimen) from 19 lakes in the Swedish National Environmental Monitoring Programme. Small (length<100mm) and large perch (length≥100mm) were analyzed separately, due to changing feeding habitats of fish over growing size. There was considerable year-to-year and lake-to-lake variation in fish Hg concentrations (-14%-121%) after forest harvest in the clearcut lakes, according to our first statistical model that count for fish Hg changes. While the effect ascribed to forest harvest varied between years, after three years (in 2015), a significant increase of 26% (p<0.0001) in Hg concentrations of large fish was identified in our second statistical model that pooled all 5 clearcut lakes. The large fish Hg concentrations in the 19 reference lakes also varied, and in 2015 had decreased by 7% (p=0.03) relative to the concentrations in 2010-2011. The majority of the annual changes in fish Hg concentrations in the clearcut lakes after harvest were in the lower range of earlier predictions for high-latitude lakes extrapolated primarily from the effects of forest harvest operations on Hg concentrations in water. Since the risk of forest harvest impacts on Hg extends to fish and not just surface water concentrations, there is even more reason to consider Hg effects in forestry planning, alongside other ecosystem effects.

Active surveillance to update county scale distribution of four tick species of medical and veterinary importance in Oklahoma.

The incidence of tick-borne disease continues to increase in humans and companion animals in the United States, yet distribution maps for several tick vectors in Oklahoma, including Dermacentor variabilis, Dermacentor albipictus, Ixodes scapularis, and Amblyomma maculatum, are not available or are outdated. To address this issue, county-scale tick records from peer-reviewed literature and passive collections were reviewed for Oklahoma. Additionally, dry ice traps, tick drags, and harvested deer were utilized to actively collect adult ticks throughout the state. Through these methods, D. variabilis, D. albipictus, I. scapularis, and A. maculatum were identified in 88% (68/77), 45.4% (35/77), 66.2% (51/77), and 64.9% (50/77) of the counties in Oklahoma, respectively. Baseline maps were developed for the distribution of D. variabilis and D. albipictus and distribution maps were updated for I. scapularis and A. maculatum. This data confirms that these four species of ticks continue to be widespread within Oklahoma with a western expansion of the range of I. scapularis within the state. These results assist efforts to better understand the epidemiology of the different diseases caused by pathogens transmitted by these tick species within the Great Plains region.