While most investigations of bilingualism document participants’ language background, there is an absence of consensus on how to quantify bilingualism. The high number of different language background questionnaires used by researchers and practitioners jeopardises data comparability and cross-pollination between research and practice. Using the Delphi consensus survey method, we asked 132 panellists (researchers, speech and language therapists, teachers) from 29 countries to rate 124 statements on a 5-point agreement scale. Consensus was pre-defined as 75% agreement threshold. After two survey rounds, 79% of statements reached consensus. The need for common measures to quantify bilingualism was acknowledged by 96% of respondents. Agreement was reached to document: language exposure and use, language difficulties, proficiency (when it cannot be assessed directly), education and literacy, input quality, language mixing practices, and attitudes (towards languages and language mixing). We discuss the implications of these findings for the creation of a new tool to quantify bilingual experience.

Questionnaires documenting children's bilingual experience have been used frequently in research on language and cognitive development. However, there has been little investigation of the comparability between these tools. In this review, we (i) provide a list of available questionnaires used to quantify bilingual experience in children; (ii) identify the components of bilingual experience documented across questionnaires; and (iii) discuss the comparability of the measures used to operationalise these components. In doing so, we review 48 questionnaires and identify 32 overarching constructs, manifested as 194 components, and we calculate the frequency with which they are documented. Finally, by focusing on a subset of overarching constructs (language exposure and use, activities, and current language skills), we observe high variability in how they are operationalised across tools. These findings highlight the need for greater transparency in how we document bilingualism and for more comparable measures.

Background: Sink drains can act as breeding grounds for multidrug-resistant (MDR) bacteria, leading to outbreaks. Drains provide a protected humid environment where nutrient-rich substances are available. Recent and growing installation of water and energy conservation devices have led to increased frequency of drain blockage due to biofilm accumulation. Ineffective drainage may lead to backflow and accumulation of water in the sink during use, increasing the risk of contaminated aerosols formation or direct contamination of surrounding material and equipment. Cleaning and disinfection procedures of sink drains need to be improved to prevent amplification and dispersion of MDR bacteria. The objective of this study was to investigate alternatives to reduce the biofilm and risk of contamination through aerosols. Methods: Sink drains from patient rooms were randomly selected in the neonatal intensive care unit of a 450-bed pediatric hospital. We tested 4 approaches: (1) new drain; (2) self-disinfecting heating-vibration drain; (3) chemical disinfection with 20 ppm chlorine for 30 minutes; and (4) thermal disinfection with > 90°C water for 30 minutes. A special device was used during disinfection to increase the disinfectant contact time with the biofilm. Treatments were conducted weekly, with prior sampling of drain water. Other drains were also sampled weekly, including a control drain with no intervention. Bacterial loads were evaluated using flow cytometry and heterotrophic plate counts. The drains were made of stainless steel, a heat-conductive material. Results: Preliminary results show that chlorine disinfection had a small impact (<1 log) on culturable bacteria at 48 hours after disinfection but not after a week or repeated weekly disinfection. Thermal disinfection using boiling water is promising, showing an important decrease of 4 log in culturable cells after 48 hours and a concentration still 100× lower 1 week after the disinfection. Repeated weekly thermal disinfection maintained lower culturable levels in the drain. No culturable cells were detected in water from the self-disinfecting drain 2 months after installation, whereas the new drain became fully colonized to concentrations similar to those of drains prior to interventions during the same period. Conclusions: Thermal disinfection of drains is a promising alternative to chlorine. This solution is interesting because it is nontoxic and easy to perform, requiring a small volume of hot water. The rapid recolonization of the new drain suggests that replacing contaminated drains is not a sustainable solution and would need to be paired with a thermal disinfection program to maintain low culturable cells.

Funding: No

Disclosures: None

Background: Nosocomial infections cause 4%–56% mortality in newborns. Several epidemiological studies have shown that transmission of opportunistic pathogens from the sink to the patient, including Pseudomonas aeruginosa, Stenotrophomonas maltophilia, and Serratia marcescens are associated with nosocomial infections in neonatal intensive care units (NICUs). In this project, we aimed to develop fast, accurate, and high-throughput multilocus sequence typing assays (HiMLST-Illumina) to detect opportunistic pathogens to assess their distribution in the sink environment of NICUs and their transfer to patients. Methods: Genome sequences of P. aeruginosa (n = 45), S. maltophilia (n = 23) and S. marcescens (n = 34) strains were retrieved from public genome databases to build their pangenomes, using the open-source PGAdb-builder server. The core genome was identified for each opportunistic pathogen and was searched for genes displaying the highest polymorphism. The minimal number of loci to include in a HiMLST-Illumina assay was determined by comparing topology of phylogenetic trees of concatenated loci based on genome similarity, computed as the average nucleotide identity (ANI) score. The primers used for HiMLST-Illumina schemes were designed in silico on a conserved domain and were tested on reference strains of each species. Results: Bioinformatics analyses showed that 3–4 loci (<300 base pairs per locus) distinguished strains with the same performances than ANI scores. The assays were tested using opportunistic pathogen isolates and environmental DNA originating from NICU sinks. The HiMLST-Illumina analysis of environmental DNA revealed the presence of at least 1 of the 3 studied opportunistic pathogens in 50% of sampled drains (n = 20). In a previous sampling, P. aeruginosa was isolated on selective culture media before and 48 hours after disinfection of a sink drain with chlorine. S. marcescens was also isolated from another sink 2 weeks after disinfection. Identification of the isolates was confirmed by HiMLST-Illumina analyses and will be typed to compare with clinical isolates. Conclusions: Initial in silico tests predict a high discriminating power of the HiMLST-Illumina method, suggesting that it would be possible to quickly identify strains of interest in a large number of samples. The power of this method is also in the possibility for molecular typing without a need for cultivation. Preliminary results suggest that sinks are readily colonized by opportunistic pathogens. This HiMLST-Illumina scheme will be applied in a 2-year intensive survey of NICUs in 3 hospitals in Montreal to evaluate the performance of new sink designs in limiting bioaerosol production and transmission of opportunistic pathogens to patients.

Funding: None

Disclosures: None

The affiliations for the second, third, and fourth authors were incorrect or incomplete, the corrected title page for which is provided herein. We regret these errors and any problems they may have caused.

The nature of structural language difficulties in children with autism spectrum disorder (ASD) was explored in a comparative study with specific language impairment (SLI) through investigation of the frequently reported ASD weakness in receptive skills relative to expressive skills. Twenty French-speaking children with ASD aged 6 to 12 were compared to age-matched children with SLI on production and comprehension of wh-questions. The two groups displayed similar effects of the complexity of the different wh-strategies. In the ASD group (as in the SLI group), these effects were not greater in comprehension compared to production; moreover, nonverbal ability (which varied from normal to impaired) was not related to language performance. Observed ASD-SLI differences are argued to largely be due to ASD pragmatic deficits, rather than to a qualitative difference in structural language skills.

This article examines whether L2 acquisition of morphology and syntax developsindependently (the Separation Hypothesis) or not (the Rich AgreementHypothesis), focusing on the acquisition of Number specification on certainSpanish quantifiers by French speakers. In Spanish, some quantifiers arespecified for Number and directly precede the head noun, in contrast to theirFrench counterparts where a dummy preposition de must appearinside the DP. Results from a grammaticality judgement task and a productiontask show that intermediate and advanced learners perform poorly on pluralinflection with some quantifiers, and reject the use of de.This suggests that they have acquired Number specification on these quantifiers,which allows Case marking on the following noun, but do not produce theappropriate morphology. These results support the Separation Hypothesis, but notthe Rich Agreement Hypothesis.

There is presently a lively debate in second language (L2) acquisition research as to whether (adult) learners can acquire linguistic phenomena located at the interface between syntax and other modules, such as semantics, pragmatics, and lexical semantics, in contrast to phenomena that are purely syntactic in nature. For some researchers, the interface is precisely the place where fossilization occurs and the source of nonconvergence in L2 speakers. In this article we focus on the acquisition of the morphosyntax-semantics interface by examining the acquisition of mood in Spanish relative clauses by native speakers (NSs) of English. In particular, we focus on the contrast illustrated by Busco unas tijeras que corten “I am looking for scissors that cut-subj” versus Busco unas tijeras que cortan “I am looking for scissors that cut-ind.” When the indicative is used, there is a specific pair of scissors that the speaker is looking for. With the subjunctive, any pair of scissors will do, as long as it satisfies the condition expressed by the relative clause; the determiner phrase is nonspecific. In other words, we are dealing not with ungrammaticality, as both moods are possible in these contexts, but rather with differences in interpretation. General results showed that the learners could appropriately select the expected mood. We also saw that performance was not uniform across the various conditions tested. However, variability is not solely a product of L2 acquisition; we show it can be found in NSs as well.

Dans cet article, j'examine l'influence de la langue maternelle sur la variabilité morphologique en production orale spontanée chez 15 apprenants hispanophones du français. L'incidence des formes infinitives en contextes tensés est élevé chez les débutants et décline par la suite. En revanche, l'incidence des formes tensées en contextes non-tensés est très faible, ce qui diffère des apprenants anglophones du français (Prévost, 2003). Cette différence proviendrait du fait que l'espagnol possède des marqueurs infinitifs audibles, contrairement à l'anglais. La surgénéralisation des formes infinitives serait due à la lourdeur des coûts computationnels associés à la sélection des formes tensées, et non à une déficience grammaticale (Meisel, 1997).

This paper investigates object omission in French longitudinal production from two English-speaking children (Lightbown, 1977). Similar patterns of object omission are observed: direct objects start being dropped as transitive verbs are emerging and licit and illicit null objects occur in all recordings thereafter. Moreover, the incidence of illicit null objects drops at about the same time in both children (month 20), which corresponds to the moment object clitics start being used productively and to the end of the root infinitive period (Prévost, 1997). I argue that object omission is an instance of clitic-drop and is related to processing difficulties. In particular, both the projection of full-fledged representations and the production of object clitics (which occupy non-canonical object positions in French) increase computational complexity for children. Object-drop in child L2 French does not seem to be affected by L1 transfer nor to be related to significant difficulties with properties at the syntax/pragmatics interface.

This paper examines the nature of finite and nonfinite main declarative sentences produced by L2 child learners. It claims that two of the main proposals on the root infinitive (RI) phenomenon, the Truncation Hypothesis (TH) and the Missing Surface Inflection Hypothesis (MSIH), are not mutually exclusive in child SLA because they are hypotheses on completely different issues. According to the TH, different roots are involved: RIs are VPs underlyingly, whereas finite clauses are IPs or CPs. The MSIH claims that L2 learners have difficulties using the exact inflectional morphology, which leads them to produce verbs with an infinitival marker or no inflection at all. These so-called default forms are finite. In principle, then, an L2 learner could project truncated structure and produce default finite forms at the same time. This possibility is investigated in longitudinal data from an English-speaking child learning German. Two complementary sets of data can be accounted for by the hypotheses. Verbs bearing a nonfinite marker are restricted to nonfinite positions, which is consistent with the TH. Bare (uninflected) forms occur in the same (finite) positions as verbs inflected for person and number, which suggests that they are finite. This finding is consistent with the MSIH.

In this paper, we argue in favour of the NO IMPAIRMENT HYPOTHESIS, whereby L2 functional categories, features and feature values are attainable, and against the NO PARAMETER RESETTING HYPOTHESIS, according to which L2 learners are restricted to L1 categories and features, as well as against the LOCAL IMPAIRMENT HYPOTHESIS, which claims that the interlanguage grammar is characterized by inert feature values. An online experiment was conducted, investigating adult learners' knowledge of properties relating to clitic projections. Advanced learners of French (L1s English and Spanish), together with a native speaker control group, were tested on a variety of constructions involving clitics by means of the SENTENCE MATCHING procedure (Freedman & Forster 1985). L2 learners distinguished in their response times between certain kinds of grammatical and ungrammatical clitic placement, as did the native-speaker controls, suggesting the attainability of L2 properties distinct from the L1.